You spend at least 40 hours a week with these people, so sooner or later you're going to get sick of small talk and want to have a little bit of fun at their expense. So when you hear the news that Jim down in sales is taking a holiday, you know just what you have to do: an epic office prank. He won't know what hit him. Of course, when it's time for you to go on a vacation of your own, you better watch your back!

Here are 18 diabolical office pranks that will make you scared to take a sick day:

Advertisement

1. You've been Cheeto'd

2. A surprise in every copy

Advertisement

3. Getting trolled... literally

4. Do you Belieb?

Advertisement

5. U mad, bro?

6. Ah, the classic

Advertisement

7. Old-school technology

8. The real victim here is anyone who sits near the copier

Advertisement

9. Getting aggressive

10. Something to make anyone with OCD flip out

Advertisement

11. Another classic

12. The air horn

Advertisement

13. I can imagine how break time went

14. You've been turned into a crazy cat lady

Advertisement

15. Subtle, yet effective

16. Rule #1: Never let anyone know what kind of car you drive

Advertisement

17. The crime scene

18. And one best left for extended vacations

Advertisement

19. The air horn gets an upgrade

Advertisement

Collage source: theCHIVE