None; the Bible doesn't mention any light bulbs.
or
An udder failure.
or
Juan by Juan.
or
Stick his bill up his ass.
or
One is really heavy, the other is a little lighter.
or
Man blows into it, but God only knows what comes out
or
Half a worm.
or
So he has nothing to chauffeur it !
or
It has a collar I.D.
or
He wanted to go to high school!
or