What about "Blood on the saddle"?
There was blood on the saddle, blood on the ground
And a great big pool of blood of around
And the cowboy lay in it all covered in gore
And he ain't gonna ride them broncos no more

Oh pity the cowboy, all bloody and red
Cos a bronco fell on him and mashed in his head
There was blood on the saddle and blood on the ground
And a great big pool of blood all around

I love it. Another favourite is "As you see the hearse go by"

As you see the hearse go by
Think you may be the next to die

They put you in a wooden box
And cover you with a heap of rocks

All goes well for about a week
Then your coffin begins to leak

The worms go in, the worms go out
They go in thin and they come out stout

Pus oozes out like thick rich cream
Your liver turns a ghastly green

Your eyes fall in and your teeth fall out
Your brains come trickling down your snout (sniff)

The moral of this story needs no explanation
It's really much better to have a cremation

Then of course there's the song "Someone tied a love-knot in the parachutists chord" with the lovely line "They scraped him off the tarmac like a blob of strawberry jam"