In one text adventure whose name I forget, you're stuck in a maze, and<p>[spoilers]<p>as you wander around helplessly at some point you start getting hot. If you take off your shirt to cool off, the game responds something like: "ah, much better. you stretch out your wings.". And with that info, the maze is solved by simply "fly".<p>I liked how it made me aware of my preconceptions, that the protagonist I was playing was just like me.