I was watching The Flying Karamazov Brothers performing their amazing comedy juggling act on stage, when they suddenly all messed up at once and dropped their pins, which caused the entire audience to burst out in uproarious laughter.
Taken aback, they asked the audience: "Are you laughing AT US or WITH IS?"
The audience unanimously replied together at once: "AT YOU!!!"
https://www.youtube.com/watch?v=XKRrfAzdpW8