It's totally normal to be frugal or careful with money, especially when you don't have a lot of it. But some people take this principal way too far, unnecessarily hoarding their resources or trying to rip off friends and family. And oftentimes, the people most guilty of this kind of compulsive penny-pinching are the ones with the least amount of financial insecurity.
Whats the tightest thing anyone has ever done to you? When I was an A level student (skint) a (rich, got a huge allowance) friend only half finished her jacket potato in a cafe. I asked if I could finish it (no pride). She said 'sure, you'll have to give me 50p though' Beat that?