Dammitall

Elevators.
Any kind of debilitating mental illness.
Pool drains, especially in diving pools.
Sometimes I imagine scenarios where there is something very, very wrong and everyone I speak to or try to get help from is completely indifferent to it.

I had a large hardcover book called "The Power to Heal" when I was a kid that had photographs of medical procedures, patients, etc. There was one story of a girl who had been left in a camping trailer when the propane tanks caught fire, and it left her severely burned all over her body. I was terrified of that picture and would get very frightened being anywhere near the book after dark.

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If one million people replaced a two mile car trip once a week with a bike ride, carbon dioxide emissions would be reduced by 50,000 tons per year. If one out of ten car commuters switched to a bike, carbon dioxide emissions would be reduced by 25.4 million tons per year. [2milechallenge.com]