Because he never pays his debts.
or
None: they just deny that the bulb ever went out in the first place.
or
6: 2 to screw in the bulb and 4 to testify that it was lit from the moment they began screwing.
or
I got you covered.
or
The lettuce came in ahead, the egg got beat and the faucet is still running.
or
"Let me see your birth certificate".
or