When my little sister was about 2 and I was 9, someone commented that my sister was very pretty. Then she went on the say "They're not a bit alike, are they".
On a YHA holiday in Carinthia, a lad said "You've got beautiful big brown eyes - just like a Jersey cow". I was most upset, but he promised to prove it was a compliment, and after the holiday he drove up to Yorkshire and drove me down to the Cotswolds where he lived, and showed e a Jersey cow to prove it was a compliment!