Try right clicking GitHub's logo 
Here's how I would improve this:<p>The lightbox that opens up asks, "Looking for the GitHub logo?"<p>But it doesn't let you answer no.  It just presumes that your answer is yes, and supplies you with what it thinks you actually want (or, more cynically, what it wants you to want).<p>I would suggest adding a "No thanks -- just let me right-click" link at the bottom.  That link would close the lightbox and prevent it from reopening for the rest of the session, which would be in contrast to its current behavior, where the lightbox pops up no matter how many times you right-click.