[moron4hire]

I'm curious what issues of false-positives and false-negatives this might have. Did I actually remember my umbrella, but the app hasn't updated the location it knows of the umbrella yet, so it starts bugging me to go back? Did I forget to turn the app on, so I leave my umbrella behind, feeling secure that I'll receive a reminder that is never going to come? Do I just plain forget my phone sometimes?

Without some way to guarantee a low failure rate, I can see something like this getting so annoying that I'd just turn it off completely.

And besides, I thought only people who rarely needed rain gear used umbrellas. The last time I visited Portland, or Ireland, I didn't see anyone with umbrellas. Everyone wore rain jackets. Incidentally, they keep your hands free.