Today I let someone try my fixed gear bike after the roadie group ride. He put on his flat bottom sneakers, I gave him some pointers on how not to crash and he set off for a cautious spin around the parking lot. I could tell he was intimidated and he took it really slow.
60 seconds later he pulls up with a grin saying, "Holy ****, that's completely different. Nothing like a road bike. I can't believe how different it is. Wow!" and such things.
I love it when that happens.
-Tim-