I taught my german shepherd this, but that was so many years ago - I'd hide an item in the house, somewhere realy hard, and send them after it. It came handy when my little sister went missing since she ran away. In other words, retrieve things using scent.
Dear bloodhounds, they're everywhere. On the couch, under the couch, I could name every place they are but don't want to.
What's the most embarrasing your dog has done in public that people have actually said something to you about?