My older brother decided at a party once that he needed to impress a girl. He thought she was cute, he wanted to take a chance, so he talked to her. And he decided he'd try his hand at lying.
Sidenote, here. My brother is not a liar. He's a very truthful, albeit somewhat boring, person. So this was out of character for him.
So to try to impress this girl, he told her that he played football. And being about 6-foot 5 with the build of a lineman, that's not a stretch. He's definitely got the physique of a football player. So he told the girl that he was on the offensive line for the University of Houston Cougars. He figured it was a safe lie because most girls don't follow collegiate sports enough to call him on it. And in this case, he was wrong.
Her response was excitement, as he had hoped. But her excitement was that she had met one of her boyfriend's teammates. She said, "No way! My boyfriend plays left tackle for the Cougars! So you must be a friend of his!"
I wasn't at this party, but I wish I had been just to see my brother's face. He realized immediately that this was a bad idea. She has a boyfriend - strike one. He plays football and you just pretended to do what he does in order to impress his girlfriend - strike two and three.
So my brother had to try to quickly explain his intentions before the boyfriend showed up again. And he thoroughly embarrassed himself by explaining that he'd never played football, and he was just trying to impress her. I don't think she even responded out loud. She just looked at him in disgust and then walked away.
I assume he left pretty quickly in case of retribution from a giant boyfriend was coming. And I honestly feel a little sorry for him. The one time he decided to lie. But I also have to give him credit. He at least picked a persona that she'd like.