NaNoWriMo? It's a push to get that writing project out of your brain and onto paper, it's super helpful for some people just to have something telling them to do the thing.
NNN? Test of self control. "I can quit any time I want" is something addicts say when they can't quit any time they want. It's also super easy; if it feels like masochism to not nut for more than a week, you're addicted.