My favorite is the one that starts "Dear Professor X." Not because that one is exceptionally funny, but because it made me think of the X-men sending these to Charles Xavier. Because you know that even the students at Xavier's School for Gifted Youngsters TOTALLY send this shit, too (Jean Grey School for Higher Learning, whatever). Except when their 97 grandmothers all die on the same day, it's because they accidentally killed them.