Physics

Professor Vlad told me a story about his friend who served in the Army in... Some country like Russia? I don't remember, actually... I'm not sure if he said that.
Here it is, roughly.

There were a lot of mines back in the day. It was said that a bunch of force will trigger them to explode. If you are walking around, usually it won't happen, but if you jump from a tree, a mine can be triggered easily. One day, a group of soldiers were all lined up. The sergeant asked them why someone can drop from a tree and trigger a mine, but not if one stays on the ground. No one said anything. The sergeant now knew that they were all very dumb. He yelled, "ACCELERATION! It is greater when you fall down!" Professor Vlad's friend, a physics major, interjected. "Acceleration is always 'g'..." The sergeant pointed and said, "Shut up."
(By the way: apparently a mine is triggered by energy of the work done, which depends on displacement.)