Three:
One to write the light bulb removal program,
one to write the light bulb insertion program, and
one to act as a light bulb administrator to make sure nobody else tries to change the light bulb at the same time.
or
When it came time to pay, the skunk didn't have a scent, the deer didn't have a buck so they put the meal on the duck's bill.
or
it was Wedgie Kray.
or
Because an undocumented worker has been living on his head for the past 2 decades!
or
but I couldn't find any.
or
The lettuce came in ahead, the egg got beat and the faucet is still running.
or
Because he want to wake up some day as America's First Dictator.
or