I know someone who hosts several open mikes per week. A couple of years ago, a friend of his came to one of his open mikes, borrowed the host's guitar, got up on stage and sat, sang a couple of songs, then slumped over the guitar. He'd had a massive heart attack and had died immediately, right there on stage.

I don't know what he sang before he died, though...

...but I've made a mental note not to borrow that particular open-mike host's guitar!