I've been framed!
or
The dentist is taking me out tonight.
or
Because he want to wake up some day as America's First Dictator.
or
1,622. One to tell the original joke, and the rest to submit give some minor variation of it! For example:
or
The question is irrelevant, since you couldn't find the dolls even if you knew how many. (Note: Well, this was a good joke in 1983-84. . . .)
or
It needed a root canal.
or