Fins Are For Fish
When I am swimming laps in the pool at the gym, I pace myself against the swimmer in the adjacent lane, and I am a decent swimmer so unless the person is excellent, I can usually keep up with them, but nothing is more annoying than struggling to catch up with a swimmer that appears to be swimming at a leisurely pace, only to find that that they are wearing fins . . . I feel like these people need to wear little flags on their goggles that protrude above the water and read "I Cheat," so that you know they are swimming faster than they normally can.