John and Brian are out and about. John notices that Brian is a bit pissy during the evening, so he finally brings up. "Yo, man, you've been cranky all damned day. What the hell is wrong with you. You're acting like you've got PMS." "Naw, I don't have PMS, but I definitely think I'm suffering from the male counterpart. I call it SRH." "SRH? What's that?" "Sperm Retention Headache."