I try to work in different themes every day. Most of the time it is Doctor Who, Star Trek and Star Wars. Some days NASA and I also have some Rock Days (AC/DC shirt, etc.). But my Darth Vader coffee cup is a monster by itself and I love it. 15 oz (that is almost half a liter) of coffee fits into it and I need to fill a lot of hot milk in, to not kill my stomach with that level of the Force!