I got a new stick deodorant today.
The instructions said: "Remove cap and push up bottom."
I can barely walk, but whenever I fart, the room smells lovely.
For the teenagers amongst us, either in age or in mind - practical joke time.
Scrape off about an inch or so of your victim's roll on deodorant and replace it with cream cheese. It will take a few minutes to sculpt the cheese in place to look like the deodorant. When finished, put the lid back on and back where you found the deodorant.