Good Pranks to Pull on Coworkers?

Oh Rebecca got jokes. She wanna throw around spiders and ish? Well, I'm betting you guys have a few tricks up your sleeve you could share with me. Help me get her back for scaring the living bujesus out of me with a spider today.

What kind of evil things can you guys suggest? The thing is, I'm the prank master flex, but all of the pranks I know are WAAAAY too mean to play on a co-worker. I was in a prank war in my 20's that lasted 2 years between my best friends and I. That's the problem. I had known these guys like 15 years plus and even they wouldn't speak to me for a few weeks after some of the pranks I pulled. Help a brotha out and shoot me some work friendly prank ideas.