Totally affectionate, chatty and incredibly strong. Just a ball of muscle. When you get head butted, you REALLY feel it.
And he 'understands' sliding doors. My office upstairs has a closet with two sliding doors. I closed them. Later I went looking for him and one door was open. Thinking I had not closed it properly I closed it. "MEEEOOOOWW" Oh. He was in there. So I got him out and closed the doors. Later I went upstairs to check my previous FB status in. And one of the sliding doors was open! And guess who was peeking out? I actually caught him opening a sliding door yesterday, but couldn't video it as I was in the bathroom and didn't have my phone. I'll try to get some video of him opening a door when I can.