Wait! Wait! I got an even better one!
Being the lone computer geek in a family of medical type people, I've learned a bunch of things I never, never, never wanted to learn. This is one. It's also... I'm going to have to dance around a bit on how to phrase this one...
Pooping can kill you.
I am not making that up. Ask a doctor if you don't believe me. I just looked the silly thing up. It's "defecation syncope". Ahem, "pushing" too hard can make the vagus nerve go whacky and you can faint. Your heart rate actually drops suddenly, you fall over and your head hits whatever it hits. In rare cases, the heart can stop.
Now, see, this is the kind of thing that had me running from the "family profession". The human body is just... weird...