Today is WOW. The department at the lecture began to talk about the difficulties arising when transmitting high frequencies. To explain, I began to make an analogy with a water tube. I started by drawing this same slang on the board. And then he drawn up a man in the genre of "stalk, stalk, cucumbers" (immediately arousing the audience's enthusiasm) and signed with big letters "ya santechneg". After which he thoughtfully quoted Ostap's question about the ability to draw, addressed once to Kisa. It turned out that it was not easy to photograph with laughing hands. and :)