Shoes and Socks

My mom has this annoying habit of saying a name of a body part and I'm supposed to point to it. Well, recently she's switched things up. She has starting to point to a body part and I'm supposed to say the name of it. So today when she pointed to her first place - she pointed at her shoes. So I said "Shoes". And she started to laugh. I didn't see what was so funny. Then she took off her shoe and asked me again what she was pointing at. Duh, "Socks!" Instead of praising me, she just laughed again. Then she took off her sock and pointed again. So I said, "Toes." And then she started to praise me. I don't get it. Why was it so funny? She pointed and I said the words. But I guess she was only doing body parts.... Mom is weird.