When you masturbate in another room till you almost cum. You then call your girlfriend or wife into the room. Upon her entrance, you cum in her eyes, thus blinding her. Once done with that, you slap your dick on her ears, thus deafening her.
Guy 1: "I gave my girl a flash bang last night."
Guy 2: "How did that go."
Guy 1: "Allow me to answer that with a question. Can I sleep at your place?"
Note: Will usually end with one angry girl.