Why do some people have a 'propensity' for/toward violence? [=why are some people violent?; why do some people have a tendency to be violent?]
She has a 'propensity' to assume the worst. [=she tends to assume the worst]
He had a 'propensity' for crime.
(..) Thank you. I've got to talk to that mailman. Oh,no,that's probably not such a good idea. You know,civil servants have a documented propensity to,you know,snap,so... okay. Well,thank you again. No problem. Bye. Oh,and bye... bro. Penny for your thoughts. What's the matter? (..)2007 TvShow: The Big Bang Theory Title: The Fuzzy Boots Corollary Season: 1 Episode 3