Hotspur:
There was a young man from DundeeWho got stung on the nose by a waspWhen asked if it hurt, he said"Not very muchIt can do it again if it likes"
In the same spirit:
There was an old man of Japan
Whose limericks never would scan.
When asked why this should be
He replied, "Well, you see,
I always try to cram as many words into the last line as I possibly can."