Fun story for the day:
I was looking at the networked devices the other day at work and came across a Chevy Suburban hopping between access points. My two thoughts were, "I really need to change the Wi-Fi password" and "Cars can connect to Wi-Fi now?" I blocked it from the network without a second thought.

Today I get a ticket in saying, "If you have the time today, my picture frame isn’t on the wifi anymore.
I was just wondering if you could fix it." I tried throwing in the password to no avail. It just wouldn't take. I reset the device, turned Wi-Fi off, nothing. It finally clicked that the digital picture frame was being listed as a Chevy Suburban in my connected devices! It was a quick switch to unblock it, and I got a nice lesson in Don't do stuff without knowing what you're doing.