So, a while ago, i discovered that you can drink magma out of minecarts in the arena. Shortly after, I melted to death. I am now going to perform some experiments to see if it is still possible, and why I melted.
EDIT1: It's still possible.
And I melted, leaving behind a smear of blod and grease from my left hand.
I was fine, so I drank two more units of magma, and now my left hand's fingers are melting and I have heavy bleeding.
And.. I've bled to death.
Well.. I get the same thin when I pick up the miecart and walk around with it, so it's holding it that melts me.