TV Tricks
My dad figured out a good one back in the 80s. Just like they do now, back then cable companies would give you a free weekend trial of a premium channel (HBO, Cinemax, etc) in an effort to get more people to sign up for those channels and pay more. However, our cable company’s method of giving you access to the special channel was to send a signal to your cable box which unlocked the channel.
To turn off the channel at the end of the free trial, another signal was sent. My dad figured out that the signal to lock it was only sent for a short period of time, so before the end of the free weekend, he would unplug the cable box and then plug it back up the next day. Since the box never got the signal, we would have a free premium channel for a while.
Usually, after a month or two it would get shut off so we’d have to wait for the next free trial weekend.