For the youngsters here, the Max Headroom TV hijacking was, I believe, the greatest hack of my lifetime. I hope it’s never solved. https://en.m.wikipedia.org/wiki/Max_Headroom_signal_hijacking

Why was this the greatest hack? It was utterly pure. The combination of audaciousness, risk, harmlessness, flawless technical execution, and lack of attribution even decades later left us to ponder a beautiful mystery that transcended the juvenile content. They took what could have been merely a nerdy pop culture prank and turned it into high surrealist art.