One time, I was talking to this gal online and didn't want to use my real name. So, I took a picture of an old out-of-state drivers license from online and fixed it for myself. I changed the name, address, and picture.
Her boyfriend was a friend of mine. He knew that I was talking to her, but he didn't know how I was talking to her. He asked me to talk to her and find out how she felt about her boyfriend. (Yeah, he was paranoid.) Anyways, I mentioned that I knew who her boyfriend was. She then told her boyfriend who she was talking to and how I knew who her boyfriend was. He got extremely paranoid. Why?
Well, it turns out that I picked the exact same name as his friend's roommate. This roommate was also from the same state as the license, but he didn't know exactly where this roommate was from. The picture I used? Yep, even though it was a different guy... it looked a lot like him. So, he started freaking out thinking that this roommate was talking to his girlfriend behind his back. He was never close to this roommate since they don't meet much. He brought his girlfriend with him to visit a friend's apartment and met this roommate.
I never knew about this until I met my friend in person. That's when he told me. "That was you!? How!? You scared me!" Hehehe!