[hahainternet]

Very few of these are really unsuitable for production. High preference and conditional operation operators are probably the ones I would be most shocked to see.

The rest (especially goatse, venus and things like X-Wing) should be fairly intuitive from operator precedence.

[to3m]

Part of the problem, if you want to call it that, is probably that people like to put spaces in their code. This leads them to see magic, when in fact they're just insufficiently practiced at scanning the code as the computer sees it.