I was walking through the parking lot at lunch and saw a bike in the bike rack with its LED headlight turned on. My first instinct was to go over and turn it off, but then I wondered if the owner would like some stranger touching their bike, even if it was just turning off a headlight. I ended up telling a security guard the light was on and he was going to try to notify the owner.

Would you have turned off the light or left it? It might not seem like a big deal to leave it on, unless the person was depending on the light to help get them home after work.