This might be a bit tough to describe, but it was posted here a while back. It's a soap opera scene. A few girls are standing next to each other, then a woman (kind of a well know soap opera star) smashes a pie in the face of a girl standing at the end of the line.

I'm very sorry I don't have more but maybe it'll trigger a memory. I believe the girls were wearing dresses.

Sorry I can't help, but I have one I want to piggyback on, since people are thinking through old soap opera scenes. There was one on a Hurley Coward or Mark Kelly Cliptape I can't find, that has a brunette get pied at a costume party. She is dressed like...Cleopatra? A Gypsy? (She has a gold thing hanging down from her head.)