Daniel Radcliffe
The British actor landed the lead role in the franchise as an 11 year old and after his first week on the set of the 2001 film, Radcliffe realised he was suffering a nasty skin problem.
He tells Digital Spy, "We put the glasses on and eventually we realised I was allergic to them. I was allergic to the Harry Potter glasses because these two rings of whiteheads and spots had come up around my eyes. It took us about a week to realise that it was actually the glasses."
The author of the Potter books, J.K. Rowling, is pleased the allergy didn't put her off casting Radcliffe.
She jokes, "It's lucky neither of us believe in signs, isn't it?"