Fun stuff heard at the gym

I went to the gym to do some workouts after a long break. The gym guy was talking with some people at the front desk, who had probably been asking for some advice, seemingly about losing weight, even though the girl whom the guy talked to was exceptionally slender and slim. When I walked in and started to wave my club card, I heard the guy say: "We know from Auschwitz that the extra kilos always go away. Even the fat Jews lost all their lard there."