Yesterday upon the stair
I met a man who wasn't there
He wasn't there again today
Oh how I wish he'd go away!
It was written in 1889, but always seems very contemporary to me.
 a.k.a., the Language of Wangst. Classical verse (a la Beowulf or Shakespeare) isn't included in this. One major exception I will allow is for the Romantics (Blake, Shelley, et al.), who while they tended towards the emo, still managed to not suck.