A flat-chested young lady goes to Dr. Smith for advice about breast enlargements. He tells her, "Every day when you get out of the shower,  rub your nipples and say, 'Scooby dooby doobies, I want bigger boobies.'"

She did this every day faithfully, and after several months, it worked. She grew great boobies!

One morning, she was running late. She was on the bus, when she realized she had forgotten her morning ritual. At this point, she loved her new  boobies and didn't want to lose them, she got up right in the middle of the bus and said "Scooby dooby doobies, I want bigger boobies."

A guy sitting nearby asked her, "Do you go to Dr. Smith, by any chance?"

"Why, yes, I do! How did you know?"

"Hickory dickory dock...."