I got beat up over a prank I pulled
What is the prank that you pulled that got you beat up?
I put a stink bomb in a co-worker's locker.
Pranking people may be funny to you but could offend or upset someone else and cause serious consequences like the ones you faced. Try to make amends with the person you wronged and see if you can continue the relationship at work.
I think it's not even that big of a deal.
You should be careful to not pull pranks on someone that actually results in them or their belongings being harmed in someway. If this happens then it is no longer a prank, but an actual offense.