Speaking to Bang Showbiz, Williams recalled one person believing him to be the U2 frontman, then seemingly misremembering the actor's name.
© WENN / Mr. Blue
© WENN / Dominic Chan
He is quoted as saying: "I had a guy come up to me in Paris saying, 'Are you Bono?' Then he said, 'Oh no, you're not, you're Robert Windsor'.
"I only really get mistaken for Bono by people who are really hammered. They have to be completely s**tfaced to think I'm Bono. I suppose when I put on the glasses I look a bit like him."
However, the star admitted: "The Irish accent is one I just can't seem to get. I always start doing it and then it just f**king fades. It always ends up going into Scottish."
Watch the trailer for Robin Williams's new movie Happy Feet Two below:
