Recently we had a question which referred to programming, mofo manifesto [warning, explicit content!]. The question was booted because of offensive content, which I agree with. However before it was closed it was edited in a way which, at least for me, was perfectly acceptable (no offensive language, warning about content under the link).
The question, to some point, was meant like a humorous approach to the subject of project management, but it seemed it crossed the line anyway.
However I recently asked rather humorous question on meta and is seems the reaction is exactly the same, no matter there's no explicit content there.
So the question pops up: how much of humor should be allowed here and whether we should have any differences between PMSE and meta?
I believe it is important to draw some lines so people know, or at least can be referred to, the rules.