Master lock, "r00t" password
This lock allows you to set your own passphrase with letters and numbers, so r00t seemed appropriate.
It worked for about six months, and then the ball bearing that "hooks" the shackle somehow became loose from the innards of the chamber, jamming the lock. Eventually the ball simply fell out and was lost a few times after fixing it, so the whole thing is useless now.
For the non-techies: Inside joke.