My own story is somewhat more embarrassing. I think it is safe to say, there are plenty of things about networking that I don't know. So, when I had to decide how to setup my own WiFi, I referred to a copy of 2600 I had that detailed instructions on hacking WiFi networks. Whenever the article said that getting around some security feature was out of the scope of the article, I made sure I turned that feature on. I'm sure a really good hacker could get in anyway, but at least he/she would need something better as a reference than the article I had read.
That part worked fine. But this year we had a big snowstorm (East Coast). The power went out for a while one night. When it came back, I discovered during shoveling breaks that the WiFi was down. So, one day I want to check my email and I search for local WiFi networks. I found an unprotected one. Unencrypted and still with the default SSID and everything. Just sad. So, I logged in, checked my email. Read the headlines on CNN.com and logged out. Smugly, I thought I should figure out which neighbor it is, so I could warn them.
The next day, I login to the router to fix my WiFi and I can't get in. My admin password doesn't work. The password was reset to the default password. It turns out the unprotected router was mine! It must have gotten reset during the power outage and I guess subsequent power surge.