When?
Avoid calling the numbers on the cards the 'clickers' hand out...
That comment made this scene from The Holy Grail pop into my mind
Sir Lancelot: "We were in the nick of time. You were in great peril."
Sir Galahad: "I don't think I was."
Sir Lancelot: "Yes, you were. You were in terrible peril."
Sir Galahad: "Look, let me go back in there and face the peril."
Sir Lancelot: "No, it's too perilous."
Sir Galahad: "Look, it's my duty as a knight to sample as much peril as I can."
Sir Lancelot: "No, we've got to find the Holy Grail. Come on."
Sir Galahad: "Oh, let me have just a little bit of peril?"
Sir Lancelot: "No. It's unhealthy."
Sir Galahad: "I bet you're gay."
Sir Lancelot: "Am not."