I teach a summer class, and a couple of years ago one of my students, from Hong Kong, walked up with a Nikon lens case, pulled out a nice zoom lens, and said "I know you're a Nikon guy, so I brought you this from Hong Kong--they're pretty cheap there." and handed it to me. I didn't know what to say, until I had it in my hand and realized the weight was MUCH too light. Right up to then, I had completely taken the bait.
It's not too functional as a coffee cup; any overflow runs down inside (mine is a functioning zoom--not all are) and pools up in the back cap. The zoom mechanism is sticky from the start, but some Door-Ease turned out to be a great zoom lubricant.
It was a great present, though.