1. Whistle
2. Running
3. Pool
4. Thunder
5. Chair
6. Snack Bar
7. Parents
8. Tan
9. Kids
10. Chlorine
11. Poop
What other people think it means: Excrement.
What lifeguards know it means: Another excuse to close the pool early.
12. Sunglasses
13. Chemicals
14. Bathroom
15. Baby Pool
16. Closing
17. Swimsuit
What other people think it means: An article of clothing you wear when you go in the pool, ocean, lake, etc.
What lifeguards know it means: The best uniform you possibly could have.