This is the converse of http://meta.math.stackexchange.com/questions/10570/title-formatting-of-latex-in-stackexchange-hot-questions-list.

I noticed that when on Math.SE, MathJax can screw up the formatting of question titles in the "Hot Network Questions" sidebar that unintentionally use MathJax control characters.

Here is an example:

enter image description here

Obviously the question on Webmasters.SE is using a $ sign in the title to talk about money, but MathJax uses it to render in math mode.