First for me was at Uni - one of my mates was a Medic and after hooking me up one night he said those immortal words...

"Want to see something cool?"

We went into the Medical school morgue/basement and he wheeled out a body on the trolley.

I was a bit stunned as the body had no head, and as I turned with a puzzled look on my face he said -

"The Dentists get all the heads"

It was so fucked up I didn't even laugh at first