I love a good culinary "gotcha" every now and again. This one is especially well executed with the matching saucer and the doily and the little floating marshmallows. I know I'd be fooled and delighted!
A trillion years ago when I was a wee tot I had a mug with a little mouse in it who would pop his head out to say hello when I was about half done with my cocoa. I'm glad to see that there is a classy adult version now that I'm an ancient lady.