When you get hit in the uterus, your navel cavity gets wet. It's a teacher who loves you.

If You're Hit in the Uterus... You get wet... The Student Navel Cavity. Teachers who are in love with you. - Kyo Kusanagi in an episode of Yokai TV-Tek. It

子宮を殴られるたびに あなたは濡れる 生徒のへそ 恋する空洞