Frozen Grand Central
The Victim: Passersby and staff at Grand Central Station in New York City.
The Pranksters: The folks at Improv Everywhere who brought you the shirtless shopping extravaganza at Abercrombie & Fitch not long ago organized their best mass prank yet. They gathered over 200 people and asked them to freeze in place on cue. We are impressed at how professional all of the pranksters acted -- no one moved or laughed.
If It Happened to Us: We'd think that they were filming an episode of Heroes.