Tootbrush that magically plays the Transformers theme music through your teeth so you hear it in your head while you brush.
Going for crazy prices (£10+) on eBay at the moment.
Black Eye Peas toothbrush available for the same price.
Buy 2 get 1 free on all these brushes.
Now priced at £3.99 but still the 3 for 2 promo works, so you can get 3 for just under £8