Maybe they took their idea from here:
A king who never could rhyme
Declared limerick writing a crime,
But late in the night
All the scribes would write
Poems without rhyme or meter.
I'm sure the clue would have made
much more sense if it rhymed.
And since I'll probably never have another chance, here's a mathematical limerick (by Jon Saxton):
( (12 + 144 + 20 + 3 Sqrt[4]) / 7 ) + 5*11 = 92 + 0 .
