Some in laws of mine are astonishingly cheap when it comes to splitting up a dinner tab. This is despite the fact that the one couple have three well-paying jobs between them. If there is not a likely sucker present to pick up the tab, another one of their strategies is to seize the check and compute the contributions of other parties in a way that favors them.
I had an experience with a cheapskate. At a dinner table, he was hitting on a girl, and was willing to order some $50 wine to impress her and invite us to take a glass as well. Apparently that little overture failed. A few days later, I got an e-mail from him saying that, since he cannot alone shoulder the tap for the wine, we should all chip in. I was not interested in drinking the d*mn wine. He tried to look generous to impress the girl, but having failed that, he found it unbearable to pay for the wine alone.