Just after the huge Tear Jerker of watching the original TOM die, we watch as TOM 2.0 arrives and kills the monster that did in his predecessor. Also a CMoA.
The revival in general, but especially for people who are imaginative. Toonami's Midnight Run is sometimes thought of as the beginning of Adult Swim. Therefore, the revival could be thought of as a son reuniting with his father.
ThunderCats headlined Toonami at its inception and stayed in the top spot for over a year, disappearing as the block made the shift away from old American cartoons towards anime and more current programming. Fifteen years later, it's back—not as we know it, granted, but still.
Given TOM 4's reception, what TOM 3.5 said about him after their first conversation could count.
The Toonami Promo Dreams, telling the viewers and those watching it to pursue their dreams and not to fear failure. To make their own destiny. Especially the words "A Boy has the right to dream." It still sticks with many a Toonami fan, ten years after it had aired and they had grown up.
The fact that a mere six people are all that's running and maintaining Toonami. Their pay isn't even going from that block- it's going from their Adult Swim duties for Turner- so essentially they're making this block for free. The reason they're doing it? Purely for their love of Toonami. Link here:  They started an official Adult Swim Toonami Tumblr solely so they can keep in touch with fans and answer as many questions as they are allowed to, showing more respect for the people who keep them alive than most other networks!
The beginning of 2013.
TOM: Welcome to 2013, Toonami fans. When I start thinking about everything we've been through together, makes me kinda... blue *cue blue Toonami title cards*
SARA's return on April 27 2013. TOM welcomes her back and she is glad to be back; so is the entire fandom.
Seeing Toonami air Sym-Bionic Titan and the new ThunderCats (2011), both of which were cancelled after merely one season (the former for lack of toy merchandise and general splitting up of its production crew, the latter for disappointing ratings). At first glance, it may seem like they're only doing this for the sake of variety and having american animation on Toonami. But think about it. It's a way of trying to showcase both nixed series at a more appreciative demographic and bringing them back to full strength. Futurama got this treatment on [adult swim] and pulled in impressive ratings for its reruns, which resulted in the show getting a revival. By airing them, Toonami is essentially giving Sym-Bionic Titan and ThunderCats (2011) a second chance they probably never would have gotten otherwise, though time will tell if the effort will prevail.
Toonami bringing back IGPX, which doubles as a CMOA. Seeing the only show produced specifically for Toonami being given a spot on the revived block is very touching.
If the Toonami Wiki is to be believed, IGPX actually suffered the same fate as fellow Toonami show Megas XLR: being written off by Cartoon Network, meaning it cannot air on Cartoon Network, [adult swim], or any of their affiliates. Toonami was able to bring back IGPX due to its complex production, but the same method can't be used for Megas XLR. The heartwarming part? The crew hasn't given up just yet, and are still trying to find a way to bring back Megas XLR.
SARA using Flash's catchphrase, "in the pipe, five-by-five", showing that the unpopular TOM 4-era hosts still haven't been forgotten.
The airing of the Korgoth of Barbaria pilot on November 2 as DST filler shows that, even today, it's still loved and appreciated by many, despite its failure to be picked up for a full series back in 2006.
Despite Beware the Batman getting written off by Cartoon Network, Toonami will marathon the last 7 episodes, ensuring that the show will go out with a bang, and that every episode will have finally aired on Toonami and television in general.