The female menstruation cycle can be confusing for men. Thus, we have Shaboots and T-Ray here to delicately point out, how once a month half the human race is in pain and the other half doesn't want to hear about it but should really be more sensitive to the other half's needs. Because, if once a month a biblical plague is coming out of your private parts, it gives you license to be a little grumpy. 

Source: comedycentral

Takeaway tip: "If you ain't gettin'em shit, get the fuck out their way." There's no way you'll be able to understand your lady's complex vagina language.