I met some of these cats tonight. Good times. They have a regular Tuesday night ride around downtown San Jose, California.
Somebody was joking tonight about a fixed gear tandem bicycle and that it would be impossible to ride one. I mentioned that I recall seeing somebody somewhere has one, but I couldn't remember who or where. I just searched on the web, and I should have known that Sheldon Brown and his wife used to ride a fixed gear tandem bicycle.