Nick Bosa's clearly been holding a grudge for a long time, and he got his revenge on Baker Mayfield Monday night.

At the end of the second quarter of Monday night's Browns vs. 49ers game, Bosa got loose and drove Mayfield into the turf, then pretended to wave a flag over his lifeless corpse, mocking Mayfield's infamous flag-planting celebration.

NICK BOSA GETS THE SACK AND PLANTS THE FLAG.



\_()_/ pic.twitter.com/13PDa1B9GT — Eleven Warriors (@11W) October 8, 2019

It wouldn't officially go in the books as a sack, since the officials ruled it intentional grounding, but a replay showed Mayfield's knee clearly down before he released the football.

“I had to get him back for it,” Bosa said after the game. “All in good fun."

I'm sure my Buckeye fans know I had to get him back.



KING pic.twitter.com/V3HwgXMHPM — Eleven Warriors (@11W) October 8, 2019

Nothing about Monday night was fun for Mayfield. Bosa was totally unblockable and was in the backfield almost constantly, finishing the game with four total tackles, two sacks, two tackles for loss, a fumble recovery, a separate forced fumble and five quarterback hits.

Mayfield was picking himself up from the turf all night, but Bosa had the time of his life and was a hero among his Buckeye brothers.

Young Bosa I mess with you for that. That flag plant been bothering me for years Go Bucks — DeVier Posey (@DPo8) October 8, 2019

I see you @nbsmallerbear waving that flag at Baker!!!! Thats incredible! Go Bucks! — Jake ballard (@TheJakeBallard) October 8, 2019

Plant that flag @nbsmallerbear!!!!! — Mark Pantoni (@markpantoni) October 8, 2019

I felt this https://t.co/mfWn5W6yBX — Branden Bowen (@BrandenBowen) October 8, 2019

BABY BEAR HELD IT DOWN! SALUTE! — Darron Lee (@DLeeMG8) October 8, 2019

Baby Bear did it right tonight! Baker had it coming... — Darron Lee (@DLeeMG8) October 8, 2019

This goes crazy bro https://t.co/RX2723Se1p — Jonathon Cooper (@JonathonCooper7) October 8, 2019

At least you did it in his face and not when he in the locker room https://t.co/QFnls9xJ6E — Jalyn Holmes Sr. (@JayHolmes_) October 8, 2019

Bosa is the only 49ers player in the last 25 years with two sacks, a forced fumble and fumble recovery in a single game, according to ESPN Stats & Info.