The sheer amount of punishment Eric takes as the movie goes on that you think he must have died this time only to see him a few minutes later still alive and walking around.
"I just don't want to become the devil's bitch!"
Ash's cameo at the very end of the credits is amusing.
Even better when you take The Stinger into account: the "Chop the motherfucker" warning? There's the subtle implication that the one who wrote that bit was Ash himself. Who else would be so crass regarding this book and everything associated with it? Definitely someone who's dealt with them so many times he's no longer that scared of them.