Nazis used tickle torture. A man named Heinz Heger was being kept in the Flossenberg concentration camp during the Holocaust. He recounted observing this strange form of torture in his book The Men with the Pink Triangle. He recalls witnesses a man being tickled with goose feathers. The man was naked and was tickled in many places of his body, including the feet, armpits and legs. The man initially stayed silent, but eventually began laughing, which eventually turned into crying.