During his set at the 2016 Melbourne International Comedy Festival Gala, comedian Joel Dommett gave a guy in the audience a button that would set off a confetti cannon. He instructed the man, “Just set it off when you think it’s the right time in the set, ya?”
Well, they say timing is everything, especially in comedy.
Towards the end of this podcast, Dommett explains the bit.
(reddit)