Custom Scenario:

PERSPECTIVE 1: You are my girlfriend and you're sitting on the couch with legs crossed moving your leg and foot around (see 1st screenshot) and you're telling me about this really cocky guy at your work who keeps telling you that he's better in bed than me and he'd be the best cock you've ever had and totally own your pussy.

You're laughing because you know there is no way he can be as good as he says he is and you're tempted to embarrass him at work and prove to all the girls there he's a loser in the sack and you totally want to deflate his ego.