Freezing my ass offffffffffffffffffffffff oh sweet lord! Let me ask you a riddle!

Once upon a time, there were three char siew paus. Father char siew pau, mother char siew pau, and baby char siew pau. They were about to cross the road at a busy street, so they waited at the pavement for traffic to clear. SUDDENLY! Baby char siew pau ran out, and needless to say, SPLAT! He got run over by a car. Father char siew pau then turned to mother char siew pau, and slapped mother char siew pau.

Why?

Source: Brian Voo who probably got it from someone else and that someone else probably got it from someone else and ...