It HAS to be the 8/10 Testicles for me.
I'm in Australia and I knew the guy giving the EXACT same talk at the convention (being in Australia we are a day ahead of the US with talks) and we showed it to the guy giving the talk and he said he was up all night practicing it.
For the rest of the convention I was there waiting and waiting until he got to the example to see if he would stuff up.
An elders son told me (as a young kid) what to do at the door, I listened and his dad was giving the intro when I stood there behind him grinning waving my hand like a robot behind his father, he did not I was doing it until we knocked on the door of my teacher and I just froze and he saw me with the stupid expression and hand wave. hahahahahaha