Boy: 'Oops. Sorry'
*Miraculously a piano falls from the sky crushes his feet so he's unable to move, suddenly a pack of dogs emerge out of nowhere attack him; tearing all his clothes off, whilst a bunch of escaped horny convicts pass by, see their chance and have their way.*
Friend: Karma's a bitch
Please note that in the Buddhist philosophy, Dharma does not 'punish' or 'reward' anyone. The concepts of good and bad don't exist here. For example, gravity is one of the laws of the universe, and if you jumped off a building and killed yourself, we wouldn't say that gravity was punishing you.