Pranks to pull at work (ones that won't get you into too much trouble)

[DJFyrewolf36]

At my dad's work, one of his buddies went over to the print shop and got bags upon bags of hole punchouts (those little things that get caught by a three hole punch) and filled his bosses office with them. The boss opened his door, looked in, shut it and told the secretary he was going home sick lol.

[Prairie Purrs]

I've always wanted to try this one: