I heard this awhile back and thought I'd share....it would be funny to do to someone!
One year at Thanksgiving my mom went to my sisters house for the traditional feast. Knowing how gullible my sister is, my mom decided to play a trick! She told my sister she needed something from the store. While she was gone, my mom took the turkey out of the oven. She removed the stuffing, inserted a small Cornish game hen, reinserted the stuffing, and put it back in the oven. When it was time for dinner, my sister proceeded to remove the stuffing. When her spoon hit something, she reached in and pulled out the little bird. With a look of horror on her face, my mother told her, "Oh no! You cooked a pregnant bird!" It took the family all day to convince her that turkeys lay eggs!