Isn't throwing rotten fruits and things also audience participation?

Likewise ladies throwing "unmentionables" on stage?

I'm reminded of the story of the theatre group in the small town Out West. The leading lady was taken ill and her replacement was one of the local ladies of the evening.

At one point in the mellerdramar the villain shoots the lady and then drops the pistol, and asks, "Oh, what have I done?"

At which point a local cowboy stood up and replied, "You've just shot the best whore in Texas, that's what!"

I must admit that at times I've been sorely tempted....