When Bianca gets home, just show her that picture.

You like like you couldn't be happier. There is no way she could get angry with that smile.

BUT!

You should bring the empty box to the gym with you. Then, as your heart rate goes up, the sweat starts to pour and you think about slowing down, look at the box. Think to yourself ... I should work out harder now, so I can have another pizza later!

The pain will be worth the prize.