"Sounds like someone swatting an empty cola can upon contact."

Thanks to reader Bob for noticing this Doug Ferguson description of the square driver K.J. Choi used to win at Innisbrook:

"(Choi) started using a new driver last week that not only is square, but sounds like someone swatting an empty cola can upon contact. Els played with Choi on Saturday and compared the sound to a tuna can attached to a shaft."