When your EDC bag contains enough battery power to keep you illuminated for a year and a half using low mode. You know, just in case you get stuck somewhere for a long time... in the dark.
This just happened to me last night. I showed off my fenix e15. My friend was drunk and underestimated the size of the light. She held it at mouth level, looked at the light and turned it on.When you show off a light to someone and forget to tell them to NOT look at it when they turn it on, because that's something you learned not to do years ago and is no longer something you have to think about.