He never got to take another mouthful.
You will guess correctly what genre that story is from that one line alone but it is what leads up to that point which is the draw for reading that tale.
So what impact are your endings having on the rest of your story? They should resolve the story, twist it, leave your reader feeling that it was an appropriate one (not necessarily happy as the above example proves!) and truly end the piece. You say what you have to say and then get out again.... hopefully on to the next story.
I sometimes write the ending first and work backwards for flash fiction. Other times I start with an interesting first line and see where it takes me but even then the ending should back up all that has gone before and tie in with it.