Don't reward bad behavior. It is one of the first rules of parenting. During the financial cataclysm of 2008 we said it differently. When we bailed out banks that had created their own misfortune we called it a 'moral hazard ' because the bailout absolved the bank's bad acts and created an incentive for it to make the same bad loans again.
When I found out I had to take off my shirt in 'Teen' movie I panicked and hit the gym. I was like 'It's going to be on film documented for my children to see. I can't be 140 pounds. I need to put on a little bit of muscle.'