I've already been banned 3 times and only been here a year. Here's what they were for to warn others:
1. Argued too much and was just too dumb in a Nintendo thread. This imo is a minefield (the Nintendo threads). Because if you say something critical or dumb you'll get pounced on by 5 to 10 users with Mario/Link/DK/Mii avatars which puts your post in the spotlight rather than just being a random post in a typical thread. 2 weeks
2. I made a reverse (?) racist joke in NBA-age about white people. I was trying to be sarcastic and funny but failed got a 3 week vac
3. Port-begged for PC version of Dark Souls, 2 week vac.
All of these were fair bans and I deserved them. These new moderators are pretty nice and reasonable (stump, nirolak, opiate, eatchildren, etc.). You would have do something really over-the-top to get several months or forever banned wouldn't you? Nudity, dropping n-bombs, that type of thing most likely.
I just avoid most memes altogether because it can be difficult to remember which are banned and which aren't. For example, I laugh whenever someone drops a "would" in a news thread about a teacher or something and I'd like to chime with my own "would" lol, but this was banned some months ago and now it's either not banned or not enforced so who knows? just skip memes