I had an emacs reference mug yesterday (which I'd gotten from Linux Pusher), but I don't today. It has disappeared off my desk, to put it optimistically. Here is an old picture of my emacs mug on my desk:

Once you've had a reference mug you don't want to go back to commonplace "Best $FOO in the world!" mugs. Only another reference mug will do. Fortunately, this is Ramboll and we have lots of free Microsoft reference mugs lying around waiting to be used. I chose a notepad.exe reference mug. Here is a picture of my brand spanking new notepad.exe reference mug: