My people had a party where there were lots of strangers, so I picked one woman to bark at. I could tell she hadn't been around big dogs that much. By the end of the evening, I had her so well trained that I didn't even have to raise my head when I barked at her. I'd just lie there, give one little "wuf" and she'd sit back down on the couch. Sit. Stay. Heh, heh.
Unfortunately, I think my people are getting smarter about the dominance game. Lately, new people I meet have been giving me commands, making me sit and down and stuff. That's not fair, because if they say my name and the command, I have to do it. I can still bark at them, but it's not as effective.