The time I foiled a bank robbery.
I built a radio out of a pair of headphones and an antenna from a broken TV. I was too lazy to hook up some kind of tuning device, so I could only pick up stations by pointing the antenna in different directions. I was listening to random things I could pick up when I found two bank robbers talking on walkie talkies about a robbery they were planning. I called the police and was able to get them arrested before they could pull off the job. As a reward, the bank gave me a thousand dollars and I can now get a police escort whenever I want.