There is a group in America called Improv Everywhere (improv is short for improvisational) and they do various “pranks” in public places.  They organize a group of volunteers, called “agents,” to do a prank at the same time at the same location.  Only the undercover agents know when and where the prank will happen!

Improv Everywhere’s mission is to show people that a prank doesn’t have to be embarrassing or dangerous - it can be as simple as making someone laugh, smile, or stop to notice the world around them.

Man #1: Did you see that guy over there?
Woman #1: They stopped what they were doing and just stood like, like frozen.
Man #2: How long has this been happening?
Man #3: I don’t know.
Bullhorn Man: I just walked in. Has it been going on for awhile?
Man #4: No.
Woman #2: I don’t think so.
Man #4: Cause this guy just dropped the papers a couple minutes ago, about a minute ago, not even.
Boy: Yeah, look at that lady over there.
Man #5: It’s like everybody.

Driver: I can’t move my cart. There’s, there’s, there’s hundreds of people frozen everywhere. This is wild.

Man #6: This is so weird
Woman #3: I know, I don’t understand what’s going on.
Man #6: I don’t either.
Man #7: I think it’s some kind of protest probably.
Man #8: It’s either that or an acting class.
Driver: They are not moving. I can’t move my cart. I, I need some help.
Agents unfreeze
Driver: Eh, never mind, they’re, they’re moving.
Man #9: That is the weirdest thing I’ve ever seen.
Woman #4: I know, it’s really cool!