While having sex doggy style, you have to subtly grab the drapes and tie them around your neck to make a mantle (works best with dark or black drapes). When its done you now start to hummm the batman song. From that you continue until your partner notice you are humuming and when (s)he ask what you are doing you start signing out loud, Batman, Batman.
High chance of self cock-block do at your own risk
guy 1 : Man, i cock blocked myself
guy 2 : How?
guy 1 : I did Sherly a batman, you should have seen her face, i couldn't stop laughing