The worst one I can remember was that I was in a theme park and went down to a platform at a tube station and someone had been pushed onto the tracks (those that travel to London will know there always seems to be someone under a train!), the person caught fire and was screaming but no one could get to him, I woke up screaming (scaring the crap out of Mike) because I could smell burning flesh! I've never had anything like it before and it really freaked me out so I told my doctor and she laughed because apparently scary, vivid and life like dreams/nightmares are one of the side effects of one of the medications I take, I now don't take them too close to bedtime lol