XKCD is awasome!
With the bike in the trailer I always get asked "how fast does it go?" by people who have never seen one.
I answer back that I usually ride it in competition at 1 or 2 MPH. They just have a puzzled look on there face.
You just can't explain (anything) to an average americian. And there is no concept of a motorsport that does not involve more power and going faster then the other guy. At time it feels like I am the only one who is not a type-A personality.