You think to yourself "You know what -blam!- it! I'm going to talk to her and maybe even ask her out." Then as your about to do it she meets up with this guy who turns out to her boyfriend. Crap like that is annoying, but hey guess you just got to move on. Discuss similar things that have happened to you. I'm bored tonight and in the mood for some talk.
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Or when you see a cute guy and you're all like "I bet he's straight.."