I had quite the little business running in school. My Mum used to work in a university library and for some reason was forever bringing home this laminate stuff to cover our school books and things.
Our country used to do these "Validate" Cards to give to kids, had the age you turned 12, 15, and 18 on them, handwritten by the teacher, with a photo on then laminated. God knows why they issued them, I suppose so we could get into 12 or 15 rated films! Anyway, I'd carefully paper over the dates, rewrite them, and relaminate them. £20 a pop, and I was minted!
Went spectacularly until my 18th birthday. Ripped the fake bit off my Validate card to reveal the original dates. Didn't bother taking my drivers licence out because didn't want to risk losing it and didn't need it with my trusty Validate Card. Rolled up to the nightclub we'd been going to for the last 2 years, handed over my card to the bouncer who took one look at todays date on it, recognised me as someone who'd been showing up for years, and said "Nah, we don't accept these any more. Too easily faked."
Home by 11:30pm on my birthday. Gutted.