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.
“A true photograph need not be explained, nor can it be contained in words.”
“My school was six miles away from where I lived on the farm. I had to walk and run, there and back every day, through gorges and over rivers. If I was late, there was a very big stick waiting for me.”