I do imagine that the person this happened to wasn't all too pleased that he/she was the victim of a prank and that they would have to clean up, however, that initial reaction had to have been a mixture of hilarity and surprise.
A person has to be one cold-hard fish for this not to evoke even a little smirk.
Silliness is universal.
Go on...be a little silly today. It's good for 'ya!