I love to collect playbills and I love to get them signed. So, when I go to shows I always pick up an extra one. That way, I can get one signed and have an unsigned one to add to my collection. When I stagedoor, I put the one I want signed on top of the one I don't want signed. There have been plenty of times where an actor would sign one and then start to go for the other one right away. Or, they would ask me if I wanted the other one signed.
Also, I have seen a particular broadway show a few times. The cast is friendly and knows who I am. And I always stagedoor. And, there was a running gag between me and one of the actors who knew who I was that had gotten thier autograph so many times I am prolly selling them on ebay. We joked about this all the time. But, the person who said that the actors can tell who are the people they have to watch out for is correct. Clearly, they were able to tell that I was harmless in terms of putting there autograph on ebay. Otherwise they wouldn't joke round bout it. Also, they knew I didn't have a credit card cus I am under 18. But yea.
"If you try to shag my husband while I am still alive, I will shove the art of motorcycle maintenance up your rancid little Cu**. That's a good dear"
Tom Stoppard's Rock N Roll