When You're Beat

I grew up with this person who was a great point-spread player against the numbers for football, NFL more than college (especially because the college lines and the college game was even screwier than it is now)

But more than betting football, this person loved to gamble on horse racing.  The problem with that was she had terrible luck at the track.  After one particularly bad day of losing on all sorts of horses, each with a name more hopeful (and an outcome more disappointing than the last) she said, "Let's go home.  When you're beat, you're beat."

She could be an idiot, but on that point, she was totally right.