Terror of the Lazy River

It’s a wonderful day at the water park, and you are a horrible kid. You’re relaxing on the lazy river ride, pocket knife in hand, when you get an idea: if you poke a hole in everyone else’s inner tube, you can have the whole lazy river to yourself! As you begin your reign of terror on the lazy river, you notice the park employees handing something to every rider except you. Are those… darts? Instr…