Page "Cú Chulainn" Paragraph 31

In Irish folklore, Cú Chulainn ( usually spelled Cuhullin ) was later reimagined as an evil giant at odds with Fionn mac Cumhaill ( or Finn McCool ).

According to the most famous folk tale, Cuhullin's power was contained in his middle finger.

Wishing to defeat Finn, he came to Finn's house, but Finn disguised himself as a baby while his wife Oona baked cakes, some with griddle irons inside, some without.

When Cuhullin could not bite through his cake ( which had an iron in it ) but the baby could ( Finn's cake had no iron ), in amazement Cuhullin felt to see how sharp the baby's teeth were, allowing Finn to bite his middle finger off and deprive Cuhullin of both his strength and size.