Ah-choo-choo!
or
Tooth-hurty.
or
Because they don't fit on a ironing board
or
Seven. One to install the new bulb and six to figure out what to do with the old one for the next 10,000 years.
or
When it's going cheep!
Did you hear the one about the crow and the telephone pole?
He wanted to make a long distance caw.
or