A young couple is having their first christmas together and they're cooking a turkey. Just before they put the turkey in the oven the guy cuts an inch and a half off each end. His girlfriend asks ""Why did you do that?"" ""That's how my mom does it."" ""Why does she do it?"" ""I don't know."" So they phone his mom and she says ""That's how *my* mom did it."" So they phone the grandma and she says ""I had a small oven.""