The finer points of emoticons and English punctuation

[foxfirefey]

highlyeccentric has a crucial question for the internets:

As I'm sure you know, O Internets, there are strict rules of English punctuation. Some of them, such as those governing the relationship of punctuation marks in series, can be a matter for heated debate.

So I must ask you: in a well-constructed sentence, shall the smiley face be placed before, or after, the full stop? If one places a smiley face inside of a parenthetical statement at the end of a sentence, how does one deal with the resulting overdose of punctuation (your sentence will look like this :))?

Please deliver a rule at once, the ambiguity is causing me distress :(. (?)