“You used inheritance in your code! Are you crazy? It’s forbidden! It’s clearly written in the Laws and Mantras of Good Software Practice Everyone Must Follow™ hanged in the toilets!” Your thoughts about the nice Youtube video full of cute dogs you saw yesterday stop abruptly. Anxious, you look on your right: Dave, your colleague developer, is yelling at Davina, your desk neighbor. All three of you are working for the fantastic company MegaCorpMoneyMaker, the famous e-commerce which can sell ice to penguins.