Barack Obama's ass cheek.
I was at an Obama rally back in August of 2007. We were at Florida A&M, in a smallish gym.
We had shaken Obama's hand and talked to him a bit, and ended up following him back behind the barricade, talking to him.
He ended up hugging us and all this stuff, but security was not too keen on it so they asked us to move.
Obama climbs up on the bleachers to take a picture with the band
Security ends up pushing me to move on the other side of the barricade (not hard, but it was crowded), and I fell forward. I reached up to grab the first thing to stop my fall.
It was Barack Obama's ass cheek.
He laughed.