There once was a lang called Scala
That was sweeter than juice from Odwalla
Whether foldLeft or foldRight
It it such a sight
To see Lists reduced down with such might!
I won’t win any prizes for that one, but I thought it was somewhat clever. Of course, ten seconds after posting it, I realized that it’s not a true limerick, because the fifth line is supposed to rhyme with the first two. Oh well. There goes my career as a poet.