YouTube's prank artist Andrew Hales sneaks up behind strangers and strikes up some of the most awkward and entertaining "Guess Who" conversations ever!
Comedian Sarah Silverman uses her iPhone in this unnecessary censorship prank on Conan.
Greg Benson of Mediocre Films goes to Golden Gate Park in San Francisco and trolls people's phone conversations by pretending to be on the phone while standing right next to them.
Prankster Roman Atwood is at it again -- this time inspiring random lazies to achieve their dreams.
YouTuber grits011: "Thanks for helping all the children and raising awareness for everything."
What does a pyrotechnics engineer get on his birthday?
A magnificent exploding cake prank, of course.
What's the best way to prank your metalhead little brother? How about completely make over his room into that of a Bieber-loving teen girl?
Stick around for the reaction.