An woman walks into the butcher shop

A woman walks into the butcher shop just before closing. She says, "Thank Heavens I've made it in time! Have you any chicken?" The butcher opens his fridge and takes out his only chicken, and plops it onto the scale. It weighs 2 1/2 pounds.

"Ah, haven't you anything bigger?" the woman inquires.

The butcher returns the chicken to the fridge, takes it out again, and plops it onto the scale, only this time, he keeps his thumb on the chicken. The scale shows 3 1/4 pounds.

"Marvelous!" says the woman. "I'll have both of them please."