I had a rather frightening nightmare today IRL. As a few of you know, I'm working to get in shape so I can enlist in the US Army. In the dream I had today, I was kicked out of basic training. It upset me so much that I actually woke up. Only one other nightmare has upset me that much, namely one where my father (who is suffering from Parkinson's Disease) has a seizure while we're out fishing and when I try to help him, I fall overboard and can't get back aboard the boat to help him.

What's the worst nightmare you've ever had, and was it bad enough to make you wake up?