Ok, my last ones, at least for a while. Warning: in very bad taste.

Why can't Hellen Keller drive?
(SPOILER)Because she's dead. (SPOILER)Also she's a woman.

(sung to the tune of "Yankee Doodle"):

Hellen Keller went to town,
a-ridin' on a pony
Stuck a feather in her hat
And called it mmuhhhh