Patrick crawls behind the couch
There's a little space between the wall and the back of the couch in the living room. Pinball often runs back there to get away from Patrick, and he's learned this. In fact, he will often chase her back there and crawl all the way through in pursuit of her.
Patrick has also started taking some of his toys with him when he crawls behind the couch. He often pushes his cars and trucks around on the floor, and as you can see in this photo he managed to take this big truck all the way through with him.