Taking a page from the thread with a similar name.
I love the Mutant Vehicles! I can't wait for The Monaco, Charlie the Unicorn, Beau Le'Phant, the pink elephant, the Intergalactic Transporter, and the ones that are awesome that I have not heard about yet!
There have been so many great ones from the past:
La Contessa, the White Whale (2002-3), the Party Duck (with laser beams shooting from it's eyes), the Death Star, the Table Saw, Tank, and more . . .