Some individuals have posted to this and suggested calling 911 as a prank. This is absolute foolishness, as well as being against the law. Additionally, site policy prohibits posting phone numbers for anything like what is being asked.
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Do the shaving cream thing. Tickle their face, yada yada. It's classic. :]Other more advanced fun pranks to do are
egging cars, dressing up in your other house mates clothes, drawing things on...
Here is a really funny one.Person: HelloYou: How many licks does it take to get to the tootsie roll center of a tootsie pop?Person: What?You: Billy GoatHANG UPPerson: HelloYou: I will eat your toes...