"What seems to be the problem," asked the cable repair man.
"I'm not sure what you call it but the picture on the TV periodically gets scrambled and snaps, crackles and pops (and I immediately felt even stupider basically describing my poor TV reception as Rice Krispies).
"OK, let me check some things out."
"I found the problem," he said a short time later, "things look fine now. The signal was getting lost in an amplifier in the attic and I replaced it. You shouldn't have problems with pixelization anymore."
It's actually a technique used primarily for censorship.
Makes sense...it just that we weren't watching anything that should have been censored.