Yep, Tobie does it too. He LOVES to play with empty water bottles and he will put the top in his mouth and roll over on his back and hold it up with his paws (or hands. LOL). So he basically looks like a baby drinking from a bottle but he holds it himself
Also, when he plays with the other dogs, he stands on his back legs and swipes at their faces with his paws... I always say that I think he's part boxer
hehe