When Sony was bragging that the PS3 was unhackable, then geohot hacked it in like 6 weeks, strong with butthurt, Sony then sued him
Geohot worked a lot of stuff up but we had the USB switch out exploit some time before then and from what I saw geohot took the stuff from the Console hacking 27c3 presentation and made it a widespread reality
The presentation in question for those that had not seen it before
27c3: Console Hacking 2010
That was a good presentation. Can't remember if I saw it live or very soon after (the stream crashed maybe for me, was rather popular) but after the background and handing off back and forth between members and it became apparent that full top level public and private keys were up for the getting...
Don't know if it is quite my favourite moment (PS3 controller did little for me, had no exclusives worth contemplating and I was already sitting pretty with a JTAG 360) but I would not be surprised if it was top 5 for most people that follow it as a thing to follow.
Would have loved to have been doing more than watching on forums during the early wild west days.
Sony also screwing up big style and including the PSP private keys inside the PS3 (which was now blown wide open) was also icing on the cake. I remember seeing it being mentioned in a thread however many weeks later and I thought someone was just a bit behind the times as we already had all the PS3 keys that really mattered, then I stopped skimming and saw PSP (though in my case I had a nice 1000 long since hacked there so that was nothing too special, other than maybe standing to revisit the Go)