We have a "circle" with how the kitchen, dining room, and living room are attached to each other. One night I started walking it, all casual like. All 3 dogs followed me, 2 of them like we were really going somewhere. The oldest girl Shepherd, she realized what was happening, and waited for me, and jumped at me when I came around the corner. Startled me! I was the one that got pranked!
When we come home from an errand, we go through the back gate and into the back door, to let the dogs out as we go in. One time, I told husband to give me time to hide. So I popped behind the corner of the garage, and listened for when the dogs would go charging by. I got her back for the prank in the house! I jumped out and she about fell over. Barked once and then realized it was me and she fell all over herself to come over. The boy dog didn't even blink an eye! The puppy thought it was a cool game, and even still she checks that corner on her way past.
I love pranking the dogs, it builds their nerves up. Nothing surprises them anymore!