Interesting -- I've also experienced that. Sometimes it's because I can't think of the word I want to use in one language, but an equivalent word in the other language gets stuck in my mind.<p>More info here:
<a href="http://www.stutteringhelp.org/DeskLeftDefault.aspx?TabID=156" rel="nofollow">http://www.stutteringhelp.org/DeskLeftDefault.aspx?TabID=156</a>