Emoticons and Parentheses

I've recently been reminded of an xkcd comic I read a while ago about parentheses phrases ending in emoticons, usually a smile. Below is an example:

(that's cool :) ......or would it be (that's cool:))

the first one merges the mouth of the smile and the ending parenthesis, and could be mistaken as someone forgetting to add something after the colon. On the other hand, the second one just looks stupid and has a superfluous parenthesis. Or is it superfluous? Hmmm...........

Any suggestions on how to solve this dilemma?