Left it at home, once, and guess what...
This happened because my habits are all screwed up by moving, but I should have known better.
Had a very vivid dream the other night that just screamed 'don't take it next time you go out.' This morning I forgot to grab it and locked the bedroom door behind me (didn't want to wake up the Mrs. to get it, and figured that after the dream it was indicative), I'd just grab one when I got to work anyway. That's the last time I pay attention to that sort of thing!
I got on the road and was almost to work when my truck loses power and practically stops cold on the interstate. Got to the shoulder safely and, after some phone calls, realized I was facing a 1-2 mile walk in the dark to a service station. I was in a low-end commerical and residential area next to a MAJOR interstate corridor, prime for criminal activity...and I left it at home.
I maintained a high level of SA, and didn't run into any immediate threats...fortunately the bg's are usually asleep by 0530 from their evening activities, and everyone else just wants to get to work.
I did get my gas (turns out I used waaay more gas moving than I realized, and I failed to believe my broken gas sensor that it was actually empty) and got to work safely...but I think this was a not-so-subtle hint to avoid doing that again. As it probably won't work out so well.
Lesson: if you keep something with you all the time, everytime you don't you'll need it. I've always found this to be true...a knife, a light, a gun, a phone, etc. If you leave it, you will need it (or at least wish you had it), even you rarely actually use it.
I should have known better, and now I do.