Today when I got to BOS to check in (and of course way after I had returned the rental car), I realized I had left my phone near Braintree. I used my wife's phone to call an UberX (my phone is low maintenance) and had the driver pick up my phone and drop it off to me in the terminal.

Phone in my hand within 25 minutes, no bothering anyone to drive it for me, no wasting my own time and extra expense getting out there to get it myself.

I've also had a driver go pick up takeout food for me from a place that didn't deliver (and before UberEATS existed).