When very young, one redditor was taking swimming lessons and the instructor decided it would be a good idea to throw them into the deep end of the pool to accelerate their learning. After their grandpa heard about it, he sent some of his old army veteran friends to teach the instructor a lesson of their own. Submit your stories: [email protected] Get 55% off your Babbel subscription at babbel.com/pop Our Instagram page: @reddit_explains