There is one thing that always bothered me a bit in the "Sandman"/"Vertigo" universe: whenever one of the Endless shows up and introduces itself, people immediately assume that they are indeed what they say they are (Death, Dream, Desire etc).
But imagine a situation: A thug goes drunk from a pub, gets hit by a car and then he sees a woman telling him that "she is Death and he has to follow her". I definitely can imagine, that there would be situations, when the recently deceased would say "the hell I am!" and try to take a swing at the short, goth chick.
Has similar thing ever happened? I don't recall anything like this in the "Sandman" itself, but Death and Daniel (the new Dream) were present in many other DC comics.
EDIT: Just to be clear: by attack I mean "intend to kill, seriously harm or disable by using physical force". So attempts to grope Desire*, half-hearted slaps and using magic/non-physical superpowers (like telekinesis) won't count.
I've read it in a novel set in Sandman's world, where woman imprisoned by Desire tries to hug him/her", just to be gently pushed away