Turn out the lights . . . 

Label this one “Not Ready for Prime Time” because the Browns aren’t even remotely close to being ready for the national spotlight.

Not after the spanking – no, make that butt whipping – administered by the San Francisco 49ers Monday night to the tune of 31-3. And it wasn’t even that close.

The Browns, who temporarily rediscovered how to play the game of football last week in Baltimore, embarrassed themselves in front of a national television audience that no doubt tuned out at the half with the Niners comfortably ahead, 21-3.

The worst move they made was actually showing up for this one because they were not nearly ready to play a game of football. They got hammered in every conceivable way.

They exposed themselves as pretenders, at least for this week, at this point of the season as they continue their Jekyll/Hyde trek through the 2019 schedule, never knowing from week to week what to expect.

They are truly a riddle wrapped up in an enigma and nobody, not even coach Freddie Kitchens, who will trundle once again back to the drawing board in an effort to unlock the growing mystery of this team, knows what do expect next Sunday at home against Seattle.

The offense turned the ball over five times, an overwhelming display of generosity that looked suspiciously like the kind of football Browns fans have been (sarcasm alert) treated to (end alert) the last two decades.

Baker Mayfield had the absolute worst game of his brief National Football League career, courtesy of a marauding Niners defense led by rookie defensive end Nick Bosa.

The former Ohio State star had four solo tackles, two of the club’s four sacks, two tackles for loss, hit Mayfield five times, hurried him a half dozen other times and was a general nuisance. He also recovered a Mayfield fumble and no doubt will be named the NFC’s rookie of the week, if not defensive player of the week.

Mayfield completed only eight of his 22 passes, threw two more interceptions, lost a fumble, had three passes batted down at the line of scrimmage and just looked lost.

The Browns were also their own worst enemy when they actually put together a couple of drives in the first half that landed them in the red zone., which for most teams is a good sign.

Not the Browns, who have displayed this season an annoying tendency to gag when inside the other team’s 20-yard line.

Mayfield moved the offense to within sniffing distance of the goal line twice in the second quarter on consecutive drives, getting to the seven-yard line both times, but got only an Austin Seibert field goal out of them.

The other possession died when Antonio Callaway juggled what should have been a touchdown pass into the air at the goal line, The ball bounced into hands of former Brown K’Waun Williams who raced it back 51 yards to the Cleveland 49.

The 49ers, now uneaten after four games, showed the Browns, how to play great football in all three phases of the game. The trenches belonged solely to the home team. The Niners outclassed, outplayed, outcoached, outhustled, outeverythinged the Browns from start to finish.

It was not a fair fight.

The well-coached home team made the Browns looks as though they were playing in a mud bog. That’s how quick and fast they were. It wasn’t so much a physical beating as it was a psychological beating.

The San Francisco offense, quite literally on its first play of the game, foretold the future when running back Matt Breida bolted out of the backfield as if shot from a cannon and romped 83 yards for a touchdown.

A fluke, Browns Nation might have uttered, remembering Nick Chubb’s 88-yard gallop in last week’s upset of the Ravens in Baltimore. Uh no. It set the tone for the rest of the evening.

It didn’t take long for Browns fans to figure out this was not going to be their night. On the first play following Breida’s run, Mayfield underthrew Callaway and was picked off by Richard Sherman. The defense held, but the pattern was set,

Just about everything the 49ers tried on offense worked, piling up an unbelievable 275 of their 446 total yards on the ground against a Cleveland defense that was designed specifically designed to stop the run. Breida and Tevin Coleman combined for 211 of those yards. The Cleveland offense, meanwhile, put up 180 yards. Total.

Cleveland area native Kyle Juszczyk was one of he main difference makers in the San Francisco offense. The big fullback made the stats sheet only twice, two pass receptions, but his outstanding blocking helped gash the Cleveland defense time and again.

To give you some idea of just how dominant the 49ers were on defense, their offense began four of their seven first-half drives in Cleveland territory. And they totally shut down Mayfield and Co. in the second half.

The Browns owned the ball four times in the final 30 minutes, compiling 29 yards on 13 plays, consuming six minutes and six seconds. Which means the defense was on the field for nearly 24 minutes. Making it worse was Odell Beckham Jr. fumbling away a punt return.

The Cleveland defense had no clue how to slow the plundering. The Niners’ offensive line owned the line of scrimmage. Of their 180 first-half ground yards in the first 30 minutes, a stunning 170 were gained before contact.

And when they got bored running the football, probably just to mix it up a bit, they threw the football quite successfully. Quarterback Jimmy Garoppolo was 20-of-29 for 181 modest yards and a pair of touchdowns throws to George Kittle and Breida.

The only positive that can be gleaned from this nightmare – and this is where I clearly reach – was the punting of Jamie Gillan, who averaged 56.7 yards on seven boots.

One now can only wonder what awaits the arrival of the Seahawks in six days. It was just seven days ago the fortunes of this team took a sudden positive turn. It was viciously slapped down Monday night.