At Christmas time, to help appear that you have a festive spirit, tie a small sparkly ornament to each piece of hair that is sticking up in random ways on your head after you sleep on it wet. Then, apply green coloured hair gel and a strong coat of glittery hair spray. Wear a green sweatshirt, add jingly earrings - and, hey, you're a human Christmas Tree. You'll be loved by all of your co-workers as you trail through the office spreading Christmas joy (and the stench of glittery hair spray, plus a shower of bits of glitter as you pass). If you can tie some presents around your waist, it will add to the effect, and hide the added inches that have resulted from over-indulging in Christmas treats. Same effect effect could be had, though, now I think of it, by fastening a festive tree skirt to cover the same area ...