Okay, probably the most autistic thing I've done was when I was in a robotics club in high school. We'd enter competitions, but only a certain number of teams could represent each school, so we first competed amongst ourselves to determine who would go. It was between me and this other guy who was really eager to go, a scrawny, fedora-wearing fellow with a barcode mustache. I wanted to go home, so I offered to decide it by rock-paper-scissors, but he opted to compete, attracting a bit of a crowd. It was a competition involving lifting objects over a fence to put them on your opponent's side. The match was close and it came down to the last second, with my robot ending in an outstretched position, hoisting a jack-shaped piece over for the winning point. I was sort of indifferent, so I stood there straight-faced and said nothing (pic related?). The other guy was visibly disappointed. After some people questioned my lukewarm response, I went over and made fun of him for not choosing rock-paper-scissors. It was a powerful, triumphant kind of autism.
Also, I made up the shiggy diggy thing.