Due to my job, I have seen quite a bit of death.
One of the worst was a man v express train. I still to this day do not know how the poor guy came into contact with early morning 100mph + train, possibly jumping off a nearby bridge but he hit the train in the left hand side of the front window and smeared along the windows of the front carriage before being dumped in the middle of the tracks pretty much unrecognisable as a human body at this point.
I'll spare you the details, but it was grim. I wasn't particularly bothered by the sight of the body, but the smell will never leave me. Like a butchers shop window in a hot day is probably the only way I can really describe it. To this day I still struggle to walk past a butchers shop without the hairs on my neck standing up.
One thing I will never forget is the look of absolute horror on the face of the smartly dressed young woman in the First Class carriage staring out through what can only be described as a heavily blood smeared window. That image is etched on my mind forever. That was nearly 20 years ago, but it still haunts me today.