Based on http://www.oreillynet.com/onjava/blog/2007/08/leadership_communication_and_a.html:

Be humble. Always first presume that you’re wrong (about your findings). While developers do make mistakes, and as a new hire you should certainly assist others in catching and correcting mistakes, you should try to ensure that you’re certain of your observation before proudly declaring your find. It is enormously damaging to your credibility when you cry wolf. %%Just ask the author why. i think it’s not so damaging.%%.