Just one?  Ah, let me count the ways...

Okay, just one.  The first that leaps to mind is one evening, calling on a 'friend' who had said that I could count on them at any time if I found myself in dire need. Having been left in a very 'untenable' position one night with no way of getting home, I had reason to call and did so only to be told that it was inconvieniate for them to assist me.  This is what has led me to being Very adverse to calling upon any one in times of crises/need.

I have decided that it is better to let people believe themselves when they say they will be there, it saves me from getting further hurt/stung by believing it for myself.