Because Sis's hair stands straight up the minute she steps on it and I never get tired of laughing at it. The boys invite her to join them in jumping just to see it do that.
Because they are nicer to each other when they play on it than in any other activity.
Because I get to listen to them laugh and play together through the open kitchen door every evening and it reminds me of how much I love my little ones still being little.
