Talkative Irishman

There's a talkative Irishman (i assume) at the table who's completely decked out in Celtics FC  attire.  Green watch, green reading glasses, green sunglasses hanging from his green striped shirt, and a green ball cap to boot.  He's got the Celtics shamrock logo all over and I can't understand a word he says....its one of those uber thick accents....I really wanna jokingly ask him if he likes Football, but I'm worried that he'll start engaging me and I don't want any part of that.