S.P.I.T.

This guy goes into a bar, sits down, orders a beer, takes a drink and shouts, “T.G.I.F!!” A woman next to him, orders a beer, takes a drink and shouts, “S.P.I.T.!!”

The guy orders another beer, takes a drink, and shouts “T.G.I.F.!!” The woman next to him orders another beer takes a drink and shouts “S.P.I.T.!!!”
This goes on for quite a while and finally, the bartender says to the guy, “Why do you shout ‘T.G.I.F’? What does that mean?”
The guy answers, “Thank God it’s Friday!!”
The bartender nods. Then he asks the woman, “Why do you shout ‘S.P.I.T.??'”
The woman answers, “Stupid prick, it’s Thursday!!”

A man and his wife

Math Help