Who doesn't like a juicy bite of watermelon during the summer? 
 
There are three ways to tell when a watermelon is ripe.  First, the tendril nearest the point on the vine where fruit stem attaches is browning or dead, second, the spot where the fruit rests on the ground is yellow and third, the classic mystery-you hear "punk" as opposed to "pink or "pank" when you flick the melon with your fingers.