King likes to harrass other dogs, and one of the things he does is walk up and make DIRECT eye contact, and if he's happy/wanting to play, he kind of makes this "AYOOOO!" noise. Most dogs do not like this,to put it mildly. He just walks up and puts one of his eyes right up to the other dog's. Some dogs just fold up, some get mad, and once in a while, he hits the jackpot, and finds someone to wrestle with.
Molly has an odd fixation. I have papers spread out on the porch, so they don't have to wait in case I'm not home in time. When I change the papers, Molly can't hardly wait. As soon as I finish, she starts spinning around in circles (for several minutes) and pees! She's very pleased with herself after she does it. If I try to keep her from doing it, she gets very upset, almost panicky.
My Pit Mix, Gus had a thing he used to do that really annoyed me, and everyone who was anywhere nearby. He loved going in the car, so we took him a lot. The wierd thing he would do was scream like hell, sounding like he was being butchered EVERY TIME I got out of the car. This was painfully loud, he could really yell, since he had a huge set of lungs on him. If the driver's window was down, it wasn't too bad, but if it was up, it was downright painful! I decided one day to try to "break him" and got out of the car every block for over 50 blocks, and he finally stopped. I thought I had cured him, but twenty minutes later, he was screaming again. This used to get people to look and wonder what we were doing to him to make him scream like that. A lot of the time, I would say to them, "He just doesn't like me to leave him alone". The cops got called on this once, some old lady said I was beating him, and I had to show them how it worked. They just shook their heads and laughed. He didn't need me to hurt him, he was always tearing dewclaws off, or hitting himself in the eyes, etc. But I don't know how many head butts, and even worse, "arm shots" where I would be holding the steering wheel, and he would slam his head into the back of my arm, bending my wrist way, way past the normal amount. This hurt terribly, and one time, I went to the ER afterwards to have it looked at, it swelled to about 3 times normal size. I had to explain what happened 3 times before the doctor understood how he did it. Kind of like a 75 pound slegehammer whacking the back of my arm. There's no time to let go of the wheel, your wrist just bends.
Before Gus, my Lab Joe and Lab Beagle Blackie used to play this really stupid game until they were ready to drop. The would stare at each other, and then race to the fence. Regardless of who won (usually Blackie), the result was the same, Joe would chew on Blackie, and growl loudly. They would do it literally hundreds of times in a row, and I never could figure out what the point was.