My sister-in-law never really understood how my brother and I could just sit quietly and watch fish in the aquarium. There's something very calming about watching fish glide through water, especially when they are yours. Well, except for Pete, a monsterous scary looking pleco algae eater who I swear will one day sprout legs and suck out people's eyeballs. There's nothing calming about watching Pete suck glass. Anyway, I feel the same fish tank calm watching my mice interact with each other. Sometimes when I'm watching them I turn to Matt and tell him, "I love my mice." He usually doesn't really say anything back, maybe just nods or something like that, I don't think he really understands.