In one of my classes, I have three pairs of sisters. And it's always interesting to me how something the older sister does within 1-5 minutes will be imitated by the younger sister. It's kind of amazing. I guess I forgot how closely sisters imitate each other.
Speaking of that class, they're a very touchy class. During the break, I'll usually be in the middle of a pile of children, with one sitting on my lap, two on either side and usually someone behind me too. It's like having 9 little sisters.