I always wear glasses when handling sulfuric acid... I'd rather that stuff not get in my eyes.
I'm not too much of a safety freak. Depends on the situation. On one hand, I'll wear a helmet when biking or buckle my seat belt. I also try to make sure the coffee pot is off. I never drink from a bottle marked poison because it's sure to disagree with me sooner or later. However, I also don't think much about handling toxic chemicals with my hands that could potentially have adverse reactions to my health. I tend to push knives towards my chest when struggling with cutting something. I like to play with fire, too. It's very pretty.
I always unplug the toaster oven when I'm done with it. And before I leave the house, I always have this pressing need to check that the stove burners are off.
I also have this issue with leaving the ceiling fans on when I'm gone. I just don't like it. Of course, the fridge is always running...and I don't freak out about that. I'm just weird.
Here's one. When I go on vacation, or away for the night, I turn the water off to the house. I've seen too many pipes break in my life when people go on vacation, only to come home to a flooded house. No thanks.
And I used to be in the habit of putting the water heater on "pilot", but I got out of that habit. I need to start doing that again when I go on vacation.