I'm a grandmother and noticed my 18 year old grandson had his left foot on the seat and his leg was bent. His right foot was on the ground, so I stretched my foot and placed it on his left foot, holding it underneath my foot with my toenails. He tried to pull it out, but couldn't because his leg was bent, so he had to stand up just to pull it out. He then explained that I scratched up his foot and I kept laughing about how I had trapped him, as I was showing him a ninja technique. As an example of how I scratched up his foot, he had me put my foot on the ground and he tried to hold it in place with his toes, scratching my feet similarly. He then had me bend my leg in the chair, similar to the position he was in before and held my foot down. Why is he doing this? Could he not accept he was beaten by an old lady?