Looking back at college, I loved the fact that I made my perverted photography professor eat his words. We were making a class magazine and it was coffee themed. We needed a nice shot of a coffee cup with coffee foam. I told him I could make a fake foam and photograph it. He said it has to be the real thing.
The next day I bring in some hot coffee, clear soap, hydrogen peroxide and yeast. I went to the back of the class and combined them and brought the mixture to him. Continue in comments
He tried to convince me that the foam would dissipate (thinking it was real) before we could photograph it. I told him that if it did I would just dump it out and make more. He could not believe that I was able to fake the foam.