In the Desert by Stephen Crane : The Poetry Foundation [poem]
I'm not much of a memorizer, but Stephen Crane's "In the Desert" is so packed with dynamite (and so short) that I got it down, somewhere back there in youth. Sometimes I used it on first dates. I thought it made me sound deep. Over time, a pattern emerged: no one who heard it on a first date wanted to go out again. Women. Go figure.