^^^^as above^^^^
I've driven an hour to go mountain biking, only to discover that I forgot my helmet. Fortunately, a local Walmart saved the day.
Right up there is what happened today. I grab my Garmin, turn it on, and discover that my son forgot to turn it off last night and hence drained the battery. Oh sure, it may not seem like a big deal to you but if you're a geek with OCD, it can be a nightmare.