We had a pool growing up. One day around age 12 I was changing after swimming and had just taken my bathing suit off and was wrestling with my t-shirt over my head when I realized my sister's friend, 17 had accidentally walked into the room and was standing there looking at me naked. She said, oops, sorry. Then turned back, looked again and said, Oh it's cute, don't worry, you'll grow. I was really embarrassed.