The Hot/Crazy Scale is a graph used to display someone's hot-to-crazy ratio.

As Barney explains in How I Met Everyone Else, a person is allowed to be crazy, as long as they are equally hot. Ideally, you want your date to be above the diagonal line, indicating that they are hotter than they are crazy.

The diagonal line is known as the Vicky Mendoza diagonal by Barney, after a girl he dated who jumped back and forth across the line by shaving her head, then losing ten pounds, then stabbing Barney with a fork and finally getting a boob job.

The bottom-right corner of the scale is dubbed the Shelly Gallebsy zone by Barney, after another girl he dated who fell into that area after gaining twenty pounds and trying to kill him with a brick.

Barney explains the Hot-Crazy scale to the gang after Ted introduces them to Blah Blah, his crazy girlfriend at the time.

Notes and TriviaEdit

• When Barney tracks how Vicky Mendoza's actions affect her position on the hot-crazy scale, some errors occur. By losing ten pounds, it's assumed that her hotness would increase, but instead her hotness remains the same and Barney lowers her crazyness. When she stabbed him with a fork, her craziness and hotness increase, instead of just her craziness. Finally, by getting a boob job, Barney leaves her hotness at the same level and reduces her craziness instead. It can be taken in consideration that losing weight equals a decline of crazy yet is not inherent to an increase in hot. Over time, a shaved head would regain hair thus increasing the hot rating yet this would be balanced out by the stabbing of the fork which clearly falls under crazy. The boob job, much like the weight loss, does not apply to an inherent increase in hotness but does reduce the actual rate of crazy, resulting in crossing the diagonal trice.
• The Hot/Crazy Scale is discussed in article 86 of The Bro Code.
• In Shelter Island, the Hot/Crazy Scale is briefly seen in Barney's calculations.

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