Caitlyn goes racing down the hall, into the office, zig-zagging around where I'm folding laundry.
"What are you doing?" I'm a bit suspicious. It's the tail-end of the day and she's probably moving her toys into the office where I'll trip over them or something.
"Running!" And she runs back toward her room. It's not a long hall, so the complete circuit requires less than one minute.
"Why?" Every parent's question.
"Because I'm crazy!" Saying it seems to have pointed out the truth in her actions. She stops running and returns to her room, where she begins having conversations with her animals and trains.