Sarge is a "singleton" which means he is the only kitten in his litter. Kittens learn a lot from each other, so it takes more socialization to foster a single kitten like him. I happen to really enjoy it, even if they are more "bratty" until you can convince them you aren't to be bitten, scratched, or chewed on. Kittens are tough!
Fortunately Sarge caught on pretty quickly and was a big but gentle kitten for his age. I love this video I caught of what he did when he had no one to play with. He loves the polar fleece fabric I use in his playpen, and sometimes it was something he liked to chew on! Does Sarge have an invisible friend?
PS - Once you start the video, there are icons at the bottom to increase the size of the video and adjust the volume.