[bombcar]

Anecdata but I've had a MacBook do the cooking once, but it thermal throttled itself so it just got warm, not super hot.

[kennydude]

Yeah I once had my old Macbook Air get insanely hot to the point it felt dangerous. I left it in the sink (dry and in case it blew up it would be somewhere non-flammable) to calm down and it was fine a few hours later.