Comic 926 - Time Vulture

Whether Philistine or man of culture
Beware of the frumious Time Vulture
Who will grimly endure
Till you croak, for as sure
As Death, Death will finally halt ya.

Original comic here.

Classic comic 483 - Fiction Rule of Thumb

If you're making up words by the barrel
For characters' food and apparel
I'll know in a jiffy
Your novel is whiffy
Unless your name's Tolkien or Carroll.

Original comic here.

Or Lear, of course!