As they say, there are two rules in improv: Never say no, and never ask why. When another actor asks 'Why?' or says no to something you're suggesting, then it's very clear that they're putting the onus on you, because they're not comfortable with it themselves.
“Donna Mills came on the show as a female antagonist, about a year before, so now they wanted to have a male antagonist. I was cast as a Senator to shake things up.”
“I'm waiting for the time when I fail - because we all fail - and I'm ready, I'll take up carpentry.”