Mercy
Featured in The Déise Dictionary
A game whereby two players interlock fingers and try and bend each other's hands back beyond human limits until the opponent uncontrollably shouts the word 'mercy.'

Cheerio! Oh wait, that's goodbye. Hello! Would you like me to translate 'Mercy' in use for you?
We interlocked our fingers and bent each other's hands back until he cried for mercy.
Any good?