Don, the joke was I was making a bad pun, and being a wise ass, implying that your admirable ability to travel enormous distances on a moped would allow you to check out every Wal-mart in the entire quadrant of your state.
Once you'd checked every Wal-mart (great excuse to go on a long Moped ride)
you would have 'exhausted' all your possibilities.
The pun on 'exhaust' was what I was pretending you wouldn't understand. I called it a 'joke' though, and it was actually a 'pun'
Or, maybe it's more funny, because you didn't get the 'joke'?
Anyway, just giving you a hard time..... funnin on ya.