Australian humorist David Thorne, best known on the internet for trying to pay a bill with a drawing of a spider, has taken his mischief to the workplace.

His elaborate pranks on coworker Simon Dempsey include replacing his business cards with ones that list his position as "Horse Whisperer" and tediously painting his black iPhone white with Liquid Paper. Thorne recently posted scans of Dempsey's complaint forms on his blog, and they detail his pranks in all their hilarious glory.

Check out some of our favorites below: