One day in Hell, the Devil was looking unusually pleased with himself: cackling and grinning and doing the occasional dance on his trotters. Eventually a junior fiend asked what he was so happy about.
"Well," said the Devil. "I persuaded God, that when he designs humans, they should all have five toes, including a really little one on the corner of their foot."
"Yes, so what?" said the fiend, utterly confused.
"Wait until these humans start inventing furniture." said the Devil. "It'll be hilarious."