Inside jokes

In no particular order:

Og: There was a poster who kept saying "Og" instead of "God" and it became really annoying, and caught on.

1920's Style Death Rays: Someone asked a rather strange question in General Questions about scalar weapons. The first response was Ah, they're 1920's-style "death rays" and the poster apparently hit the submit button three times, because that post showed up three times. Then there were pages and pages of people mocking this accidental triple-post, saying "No, actually, I think they might be 1920's style death rays" and the like.

I burning your dog:

When come back, bring pie: See http://www.weebls-stuff.com/wab/pie/

Hi, Opal: A user named Opal (since changed to OpalCat) used to complain that if you were going to make a bulleted list, it ought to have at least three items. So whenever someone posted a list with only two items, they would include a third bullet which would say, "Hi, Opal!" Now, it's sometimes used even with longer lists, which is rather silly if you think about it.

Once. For 20 minutes. In 1960:

Penis ensues: