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.
“All I can say is, hey, if you have fun doing what you do, if you have fun playing soccer, the creativity is just going to come as time goes on.”
“Say this for big league baseball - it is beyond any question the greatest conversation piece ever invented in America.”