Kelly is best known outside Ireland for playing Father Jack Hackett in the comedy series Father Ted, which aired originally in the United Kingdom in April 1995 and ran through until May 1998. Father Jack is an old and somewhat perverse priest who usually only says "feck!", "arse!","drink!",and "girls!" in that order. Also for one episode when three Bishops come for a visit, Father Ted Crilly teaches him how to say "yes" and "that would be an ecumenical matter" in order to prevent him from insulting them with crude answers.
For his role in Father Ted, it is claimed he wore contact lenses (to show Father Jack's blank eye) and he said that people would not talk to him if he was in his Father Jack make-up.
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