I love when restaurants offer crayons to draw on tables place mats.
Adoro quando os estabelecimentos oferecem giz de cera pra desenhar nas bandejas/toalhas de mesa de papel.
That Drawsomething app is addictive, but i still like Twitdraw.com a lot, because others can scribble over your drawing for fun, creating a new version.
And you can see the whole drawing process in different speeds.
Here are a few doodles: