Two golf fans

Bob and Tom both like to golf. One day Bob went to Tom and said, "Hey look at this great ball!" Tom replied, "What's so great about it?" Bob said, "Well if you lose it, it will beep until you find it, and if it goes into the water it will float. This ball is impossible to lose!" "Wow!", said Tom, "Where did you get that from?" Bob replied, "I found it."