Couldn’t not post this one from Improv Everywhere, due to this blog’s well-documented pro-Ghostbusters bias.
I am largely in favor of anything that causes mass confusion of the harmless variety. See also: SantaCon, No Pants Subway Ride, guys riding unicycles down sidewalks, etc. After all, not everyone can be these guys:
If someone asks if you are a god, you say "yes!"
This kinda prank is distinctly different from Improv Everywhere’s other kind that targets specific people. Recommended listening: this great This American Life episode about the victims of some of those pranks, and how the WTF-esque experiences affected them.
Inverted Soapbox 