Everyone claims to be Irish, especially in the movies.
There are a whole lot of famous Irish characters in the history of cinema, from Ellis Red Redding in the Shawshank Redemption to...eh...the Leprechaun from the Leprechaun movies. Alright, we're more proud of some characters than others, but they almost all appear in this supercut of people claiming that they're Irish from a whole selection of different movies. Of course, it features Pierce Brosnan and some diddly music.
Kiefer Sutherland's Irish accent needs some work, though.