The StackExchange button in the upper-left corner of all of the sites is a menu. It has the little down-arrow next to it, and after clicking, a menu-like thing pops up.
When I want to dismiss the box, I do what seems natural, which is clicking again. Just like any other menu - you click File, scan the items, and then click File again (without moving your mouse) to dismiss the menu.
However, when you click this popup, now the button under your mouse is a link taking you to "stackexchange.com". This is frustrating! Now I have to move my mouse to dismiss that box, but I'm never really thinking about it, so I always end up at stackexchange.com.
Could we fix the UI? Maybe make that link 10px lower so that your mouse isn't hovering over it when you click the StackExchange button? Or something?
Edit: It looks like this has been done. Thanks stackoverflow team!