In Icecrown, Frazzle Geargrinder will give you a daily quest to use her Jump Bot to jump all the way to the highest point of a nearby mountain, and then plant a flag (Alliance or Horde flavoured, depending on your persuasion).
Along with having a whole lot of bouncy fun, I also got a cute surprise when I tried to shift to birdy form to go back down the mountain. Now, as we know from most other vehicles, shifting doesn't usually work. It just spits back an error message that you "can't do that right now" or similar. I always do it anyway.. mostly out of habit.
But this time, I found that it did work.
I couldn't fly (much to my extreme disappointment), but oddly my shadow took on aspects of my forms when shifting. Cat form gave me a tail (*shudder*), bear form large paws, etc.
Cute? Disturbing? I can't quite make up my mind. The shadow makes me think of the winged monkeys from the Wizard of Oz, or something. Gives me the willies!