Several years ago, one of my coworkers discovered some software that let you design a graphical user interface fairly easily.  He was used to writing code with simple command line interfaces that were unattractive but functional.  So he kind of went to town designing menus and buttons and whatnot.  The weirdest, and worst, design decision he made was to include a popup dialog box when you tried to exit the program.  The dialog box simply asked, "Are you sure?"  I remember asking him why he included that, and it generally had something to do with seeing a similar function in another piece of software. 

I often find myself confused or bewildered by some sort of designed object, and I have to remember that there's a good chance a feature or function was designed by someone, possibly an intelligent technical person with no design experience, with little to no input from an end-user, simply because it was possible.