I've never met anyone famous. I was once asked what I would do if I ran into David Beckham. I've been obsessed with him since his pre-Mr-Spice days, and yes, sadly, I still am!
I honestly don't know what I would do if I was to meet him though, cuz it would be such a huge deal. I would like to be able to say that I'd be polite, and chat to him and maybe get a photo or autograph, but I reckon I would most likely either stand and grin like an idiot, or launch myself at him stalker-style and get arrested for harassment. For his sake it's probably best that I don't ever run into him.