Thank you all for your wonderful suggestions! I will definitely try them if I have such a disaster again. This particular angel food cake recipe called for greasin the pan AND it had more flour than others, so was slightly heavier. I normallly immediately invert an AF cake out of the oven to keep the loft, but this one fell right out of the pan. Hence, the collapse. I can laugh now! Love this forum, you all gave me good answers, although I ended up throwing out the mistake while waiting for these excellent answers.