One moment I was proud of as a player was in high school and we were playing Demon: the Fallen. I was playing a Luciferan and had powers of fire and heat control. We were the prey in a car chase that was not going well for us. I hit on a rather desperate idea and asked the Storyteller if it would be possible for me concentrate on using my powers to overheat their engine. He gave it a moment of thought and allowed it. Success. There was a moment's silence before we all started cackling in gleeful triumphant shadenfreude. Black smoke started pouring out of the hood of our pursuers' car, they ran off the road and we made a clean getaway.