When putting on skinny jeans, your leg hair is swept upward. Then after taking your pants off, your leg hair are still pointing up.

Usually return to normal after an hour or two on their own or after a shower.

Sometimes painful

A psychological disorder found typically in young adults, whereby the sufferer is of a dilutional opinion that he or she works harder than any other human.
This syndrome usually manifests itself when the affected individual is employed for the first time in their life.
Dilutions may be controlled by rigorous reinforcements of reality by the sufferers' friends or family.