One of the funniest things I ever saw was at Ace Frehley last year (which was a good show, so it doesn't really fit here, but...). We were in the third row (that's important to know), and a few songs into Ace's set, the woman in front of us walked out. I assumed to go to the bathroom. A couple minutes after she came back, my buddy tapped me and leaned over and said, "She went and took her panties off. She just handed them to her boyfriend." A few seconds later, he threw them onstage.
Well, in the direction of the stage.
He barely got them on the front edge of the stage, about three or four feet on OUR side of the monitors. From the second row.
They spent the rest of the set trying to figure out how to get them back. They finally got them during the set break, then he threw them from right at the edge of the stage and got them to Ace. At which point, dim bulb girlfriend covers her face and acts all embarrassed.
Thirty-some-odd years ago, I saw a more successful, and somewhat more sordid display play out at a Ted Nugent show (but much farther away from me). Let's just leave it at Ted was much more exuberant in his appreciation. And, at three different shows, I did get to see various donations being made to the Frank Zappa panty quilt (again, from a distance).