6: 2 to screw in the bulb and 4 to testify that it was lit from the moment they began screwing.
or
2 years old.
Cow: "Mooooove over"
Sheep: "Naaaaaaa."
or
he got a little behind in his work.
or
Only one. But he'll leave a big puddle of spit on the floor underneath him.
or
On the latest episode of "Celebrity Apprentice", Donald Trump fired himself!
or
A taxi driver.
or