Barney: There's no way she's above the line on the hot-crazy scale.
Ted: She's not even on the hot-crazy scale. She's just hot.
Robin: Wait, hot-crazy scale?
Barney: Let me illustrate. A girl is allowed to be crazy, as long as she is equally hot. Thus, if she's this crazy, she has to be this hot. If she's this crazy, she has to be this hot. You want the girl to be above this line, also known as the Vicky Mendoza diagonal. This girl I dated, she played jump rope with that line. She'd shave her head, then lose ten pounds. She'd stab me with a fork, then get a boob job. I should give her a call.