After returning from a Disney World trip, he told me how he spent most of it on the hotel room floor because he 'threw his back out' and had general chest pain. Nothing excruciating, just annoying enough that he wasn't up for hours of walking. His friends told him to go the doctor, but he blew it off and said he was feeling better.
The next day he died in the store, behind the register, before we opened, from a heart attack. He was 36.
Last year I went to an urgent care because of chest and back pain. They sent me on to the ER after an EKG showed an abnormal rhythm. Turns out I hit the rowing machine too hard the day before and had a massive case of indigestion from Mexican food at lunch.
I felt silly, but really everyone that I dealt with was cool about it. I'm lucky enough to have insurance that covered it all, and I'm happy that it wasn't a heart attack.
I don't know if there's a moral to this story, just that... shit, you never know when your day is coming, and I still have a lot to do before it happens.