This should make everybody else feel a little smarter. I'm riding down MLK (Dr Martin Luther King Jr Blvd) in Pompano, not a nice area, but a good shortcut, when the main tank went dry. No problem, I'll switch to reserve. D'oh! It's already on reserve! I coasted onto the sidewalk, got off and started pushing. About a half a mile later, I got a little gas from a construction truck.
The moral of this story is: If you're dumb, you gotta be tough or lucky. And switch back to the main tank after a fill-up.