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.
“Behold, I am become a reproach to thy holy name, by serving any ambition and the sins of others; which though I did by the persuasion of other men, yet my own conscience did cheek and upbraid me in it.”