Imagine you’ve just run into a celebrity – whether on accident or on purpose – and you want their autograph. The last thing you want is to end up being part of a story they tell about obnoxious fans, so use common sense. If they are eating, talking on the phone, at the airport waiting to board a plane or otherwise look busy, don’t run up to them with pen and paper and demand they sign. Celebrities are people and they need their private time just like everybody else. If you wait until they’re alone, you’re much more likely to get the autograph you want.
When you do go up to the person, above all be polite. Celebrities get pushy fans all the time and you don’t want to be one of them. Ask for one autograph, maybe a picture if they’re willing and you have a camera. Speak normally – don’t 
overwhelm them or be overbearing. Smile and be friendly, but don’t be annoying. Don’t monopolize their time. You can chit chat for a few minutes while they’re signing – offer a compliment or two, they’ll like that – but don’t talk just to fill the silence.
Be sure to thank them no matter if they sign or not, and don’t take it personally if they don’t. They’re not obligated to give autographs. The last thing to remember when asking for an autograph is that if you run into a celebrity at a normal setting, they’re probably counting on doing their own thing and not being bothered. Follow their non-verbal clues and respect their boundaries.
