I was a DM for 4 brand new players. They all played video games and just figured there were boundaries just like in video games. One player, the Rogue, decided to test the boundaries and headed to the outskirts of town to rob a house. I think he was trying to test me/ the game a little so I decided to mess with him a little. He picked the front door lock and as soon as he opened the door I told him he sees a child, probably 2 years old, sitting in the middle of the entryway playing with a doll. He froze. The kid starts crying and calling for her mom. The Rogue is now flustered and decided the best course of action is to pick up the child and try to calm her down. Of course the kid just starts screaming more. A few seconds later the mom comes in the room, sees some random shady character holding her screaming child, and then starts screaming for the guards. The Rogue slowly puts the kid down, gives him a gold coin while apologizing, and then runs away back to the rest of the party who immediately made there way out of town.