"Fly in the soup." When I was about 8yo, Mom and Dad took me to eat at Stan Musial's restaurant in St. Louis. Early into the meal,Dad noticed Mom not eating her soup. Eventually, she showed him a fly had drowned in it. Dad called waiter over, and advised that Mom was a great outfielder......had caught one of Stan's flies. I was mortified.Haha! Even hint that your Sister in Law is getting fat will put a fly in the soup!