He actually says "I’d die or become crippled about five times before reaching my life expectancy." Being crippled does not necessarily preclude you from taking

He actually says "I’d die or become crippled about five times before reaching my life expectancy." Being crippled does not necessarily preclude you from taking a shower. Therefore, if you look at his expected value of "having a significant fall in the shower" instead of "dying in the shower", it doesn't have the same problem of being impossible. Obviously all 5 can't be fatal events.