I assume you mean a human body.
I was 32. I was tripping on magic mushrooms with two friends. We were walking near the bay in Melbourne, on a beautiful sunny day. I noticed a body lying face down in the wet sand (the tide was going out). I was immediately aware that this was a corpse, which was strange because it was, as I say, a bright sunny day, and hundreds of people were walking around enjoying themselves. And I was tripping.
I went over to the body and made certain of what I was seeing. Fortunately, I had the sense to realise that it was best not to turn the body over - I'm glad I didn't gaze into a fish-eaten face.
I realised that lots of people were just walking past (5 metres away or less), either acting like they couldn't see it, or demonstrating that amazing human capacity for strategic ignorance.
I left my two friends with the body and went up to the nearest main street. I waited a minute or so for a police car to come down the road ( there were always plenty in Fitzroy Street, St Kilda at that time). I stood in the centre of the road and flagged the police down. Which was a very weird thing to do peaking on shrooms. Even weirder was when the police emptied the van of the various perps they had locked up in the back, and asked me to hop in and direct them to the scene. So I was locked in a police van, telling two young rookie cops where to find a body.
A memorable day.