I heard somewhere that if you give your name in Irish to a Garda (Irish police) and the case goes to court (say you are pulled over for speeding or something), the court case must be conducted through Irish (the Irish state has two official languages - English and Gaeilge/Irish).

This could be a hilariously clever way to run down the statute of limitations as barely anyone in the country speaks Irish, and that includes judges and barristers. I think the Gardai have to pass a certain minimum level of Irish to get into the Garda training college. This could be just an urban myth though, so take it with a pinch of salt.