Improv Everywhere crew is the group which makes various events to bring smiles to the most unlikely of places. However a joke may go too far. For example, recently the group wrangled around 100 cars and parked them in a lot in Staten Island. Then a kapellmeister ordered people to hide in a secret place and press the panic button on their key fobs from a hidden location, resulting in a "car alarm symphony."
Here is the video of this juvenile fun:
All the situation at the parking lot reminds me a plot for Apocalypse with a rise of machines =)