Ah! Limericks.
1) The Shark Tank has a contributor (O2BIrish) who posts a clever lim most every day in the comments. It's IT humor, & kinda inbred (ingrown?). unkk posts haikus also.
http://blogs.computerworld.com/sharky2) I have THE book of dirty lims. Can't post any here.
3) OEDILF. Google it.
4) Easy way to remember the limerick syllable structure:
"
Limerick Limerick Limerick
Limerick Limerick Limerick
Limerick Limerick
Limerick Limerick
Limerick Limerick Limerick
"
And the rhyme is "AABBA"