Nintendo's tendency to remove blood from its games was referenced in Melee's End episode 5:
Mario: What do you want, Ganondorf? Ganondorf: I have come for your blood. Marth: Oh, not my blood! Fox: You don't even know what blood is. Mario: Guys, this is a Nintendo game. Don't worry. Ganondorf: I've coughed up plenty of blood in my day. Nintendo can't save you now! Fox:Your blood is green.
Incidentally, that red blood to green blood act of censorship is only available in the last version of the Ocarina of Time (v1.2 on N64, and also used in Ocarina for GameCube, Master Quest for GameCube, and Ocarina for Virtual Console and also Ocarina of Time 3D for the 3DS, which includes Master Quest). The most widely distributed version of Ocarina of Time is v1.1 on N64. It has Ganondorf with red blood, as does v1.0 (the initial release golden cartridge).
Bronyism's Cynical Asshole self-censors his other account, naming it "Cynical Jerk" instead.
The first half of Red vs. Blue's second season was criticized for a noticeable absence of vulgarity. Rooster Teeth tried toning down the language after receiving messages from people who wanted the videos to be appropriate to watch at work. When the removal of language was met with an even worse reaction, the cast and crew decided to abandon the idea. The hilariously over-the-top profanity of Caboose's "mental image" of Church served as the point where the show's dialog returned to form.
Parodied in Arfenhouse Teh Movie Too, where one character says "ow" while the subtitle shows "FUCK!!!" struck out before it.
Lampshaded in Paw Dugan's Top 9 Composers video, where Paw is Trapped In Game Land. In the Wolfenstein 3D portion, he comes upon Bowdlerized versions of the Hitler portraits and comments that something's missing. After a quick Fade Out and Fade In, we see a crudely painted toothbrush mustache applied to the painting as Paw comments "Much better!"
Forumer (a free internet forum provider) decided to update their TOS to become more child and general audiences friendly. They also decided to run a program that changed all sorts of words on every single Forumer forum to "work safe" alternatives. The change was based around cooking - for example, 'fuck' became 'bake'. But some of them were just bizarre. 'Little' was auto-changed to 'cilantro', 'video' was changed to 'recipe', 'girl' was changed to 'steak'...