"This is Just to Say That I'm Tired of Sharing an Apartment With William Carlos Williams", from McSweeney's, via Adam. Here's a sample:
If I find one more note taped to the bathroom mirror with some garbage like this...
this is just to say
I am sorry
I used
your toothpaste
it's all gone
and I
have gingivitis
there's some
raspberry
floss left under
the cabinet but
it's gross
and expired... I'm going to break your face.
This is fantastic.