One day Pebbles Flintstone got scared and hopped in bed with Wilma and Fred. She looked under the covers on Wilma's side and asked what that was and Wilma said well Pebbles thas my rock. After that Pebbles looked on Fred's side and asked what that thing was down there and Fred replied thats my rock grinder. So Pebbles layed there for a few minutes then sat up and said so mommy puts her rock in daddy's rock grinder and out pops PEBBLES! ! ! !