The funnyman was imitating England goalkeeper Joe Hart during a soccer skit at the Cork Opera House, but he hurt himself and was seen clutching his leg in agony.
He returned to finish his set after an interval, stunning fans by appearing onstage with crutches.
McIntyre sat down for the rest of the show and joked to the audience: ""You can search your souls. You're all entitled to your money back. Don't mind me. I am very rich. This is not the show you paid for - unless you enjoy casualty waiting rooms.""
Afterwards, he added, ""Work in Progress is what the show is called and I thought around the age of two I'd learned to walk. Unfortunately that's what needs work rather than the jokes...""