Maybe when you didn't make the sale, get a raise or promotion or get the employee of the month award at work, your family should greet you at home wearing paper bags.
I know in my business,I explain to every person I hire what is expected of them.
If they meet or exceed those expectations I reciprocate,with a bonus.
If they don't,I encourage them to try harder and improve.
Sometimes this works,sometimes it doesn't.
If I thought wearing a paper bag would motivate someone I'd give it a try.