In order to help Patrick sleep through the night when he was about 1 year old we started giving him smoothies in a sippy cup before bed - lots of filling yogurt, milk, and fruit. Although we rarely make smoothies anymore, he's been attached to his sippy cups ever since - we have about 6 with varying designs, but they're all silicone-straw sippies and he practically refuses to drink from anything else. Lately he has also begun refusing to drink from these cups unless they are in a shoe, preferrably a boot (we're assuming its for their coozie-quality warmth feature, as his favorite drink is hot chocolate). This morning he tried his cup in any different number of shoes, even his church shoes, but eventually went and got his trusty snow boot. What a weirdo, we love him to death.