Always put the mustard and ketchup on the bun before you put the hot dog in. Especially if your child is a messy eater. If you forget, and put the condiments on the hot dog, turn the hot dog over so the condiments are completely surrounded by bread.
If you meet another princess wearing a Cinderella dress like you AND her name is Lydia, too, it may be the most magical thing that happens to you at Disney. If she's riding on the same bus & staying at the same hotel? Magic is the only possible explanation, isn't it?