People tend to hang onto that stuff.. it may be in an old drawer, but I'll bet they still exist..
My deal is guitar picks.. I have custom picks made with my designs on both sides.. I line my mic stand up with at least 30 picks every night.. I never break picks - once in blue moon - but I'll hit a power chord and throw them frisbee style into the audience.. you'd be surprised how far you can throw a guitar pick frisbee style.. I can peg people in the back row pretty easily..
Sometimes, we'll do a song that has a power cord and I hold it for 2-4 measures.. normally what I'll do is flip my pick about 5-6 feet up in the air - straight up - with a flipping end of end technique that makes it go straight up and down.. Most of the time I'll catch it, but quite often I'll accidentally hit it with my catching hand and send it flying and gotta grab a new pick off th emic stand.. there's one video where I didn't catch the pick EVERY time I threw it up and went through almost all 30 picks in one song.. People wear laughing, so I kept doing it because, if they're laughing, they're being entertained.. when I finally caught one, there was a huge cheer lol..
I mostly sign the 11x17" flyers I create for each show and hang all over the venue.. people rip them down and have me sign them after the show.. that is my greatest honor and the one thing in life I probably enjoy doing more than anything else.. I know a LOT of those exist because I've seen them hung in people's houses..
Friendship is like peeing your pants.. Everybody can see it, but only you can feel the warmth..