My girlfriend recently got a laptop that was able to run Minecraft, she'd played it on my computer, but my computer is my computer. Since getting her laptop, she loves minecraft. We actually spent all of Saturday playing together on a server I made. I told her that survival would be more fun in the long run, and it was. She went exploring in caves and got really excited when she found gold! She felt lucky!
A few moments later, she fell into lava and lost all her stuff. Including the gold she had just coveted. She had that elation and subsequent frustration. She'd only played in creative mode before, and she did admit that as much as it sucked, she felt the game had more value when she'd found the stuff herself. She lost the diamond pickaxe I gave her too, she was cross about that. I'm a stickler though - I think the game is much more fun without cheating, and it's more fun with more than one person.
My girlfriend respawned happily, crafted a sword, and slayed me mercilessly. I shit you not. She killed me because she was grumpy about falling into lava. She took my stuff, too.
She did give my stuff back eventually, but it made me wonder what kind of monster I had created...