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.
“Cruelty is a part of nature, at least of human nature, but it is the one thing that seems unnatural to us.”
“God may not play dice with the universe, but something strange is going on with the prime numbers.”