Ha! I remember reading a Highlights Magazine bit where there was a picture of a dog trotting and a dog galloping, and it asked, "Which dog is going faster? How can you tell?" I seriously thought they wanted a biomechanical explanation, and I felt stupid!

One day as a young adult, I idly worked out the biomechanical explanation in my head (opposing front legs vs. back legs gives a longer stride than opposing left legs vs. right legs, which makes a gallop a more efficient gait). And THEN I realized that Highlights Magazine just wanted an answer like "because of the legs." LOL!