Joseph

This is totally wrong.
It should be:
Carjacking = Can I borrow your car? - Yes, you may.

Felix

Can't it be generalized as:
Carjacking = Can I borrow your car? - Asking permission first.

Jesse

While the ideas kept me amused, his use of notation left me confused.

Guy, Western Australia

Some of those are very clever, I liked the one for ignorance;

http://www.morenewmath.com/140/ignorance/

David

Carjacking = Can I borrow your car? That was a rhetorical question.

Randy

Good, but not as good as Indexed, which is sorely missed.