I've always objected to the way football players commonly keep the ball after a lucky play. The ball was painstakingly produced by factory laborers so that it could be used in games until it wears out.
This destiny is violated when a sentimental fool indulges his child-like vanity and shamelessly walks off with it. How unbearable the boasting of that player will be when he dusts it off and shows it to someone. If he comes to his senses and regrets his possessiveness, it's too late. The NFL won't take it back.
I know the league charges a nominal sum, but the fee should be increased so as to prohibit most, if not all, souvenir hoarding.