Those Wascally Wobbahs
Son: "Mommy, Lydia had a wobbah in her house! Do you know what that is?"
Mommy: "No! I've never heard of a wobbah."
Son: "It's when someone comes in your house in the niddle of the night and takes your things."
Mommy: "Oh. That's a 'robber.' Can you say, 'robber'?"
Son: "Robber. But, Mommy, they had a wobbah!"