Had a guy one-up this in the crowd during a NASCAR race where I was volunteering. Young kids, maybe 20-25, all with their shirts over their shoulders - it was a hot day. As they walk past, I'm aware of them, but they're smoking and joking, not paying anyone any mind. I hate crowds and I'm a bit on edge, but not worried about these kids at all. They just look like they're having a good time.
Then one suddenly leans over and grabs at me with both arms - later, I think he was trying to hug me... wierd. I ducked out of the move and pushed his arms aside thinking he was going after me, and am ready to go but fully expecting to get pummelled by the group. Jackie Chan I am not. He sort of rubs my hair briefly as I duck under one arm and behind him, then looks over his shoulder, smiles briefly (not an evil or malicious smile, a genuine, "Hey bud, hope you like the race" type of smile - double wierd), and keeps going on, laughing with his buds (a couple turn to look, but that's it). I watched till they were out of sight and didn't see them doing that to anyone else, and still don't get it. Pretty sure it was some sort of dare, and harmless, but I can see someone with a hot temper running him down afterwards.
I guess I should search to see if I'm on a Youtube prank video somewhere.