I once was sitting in a somewhat boring class on networks and computer architecture towards the end of the term. Nobody was really listening and the lecture was kind of a collection of random bits and pieces related to the subject matter.
So I tried out playing Duke Nukem on my rather weak laptop on DosBox. I was sitting quite in front of the class room, and the profesor could clearly hear my fan working like crazy. Later in his lecture he did a short excourse on cloud gaming, showing us nVidia's graphics card cloud where you could do remote gaming, the graphics being rendered remotely and streamed to your box over the interwebs.
I looked up from my game and said to the professor: "If I had this now, my fan would not be that loud." Even the professor laughed.