Guitar-slinging-rocker-Sunny-D-gives-rehearsal-his-all,-so-he-wishes-drummer-Dex-Parker-would-do-the-same.-When-Dex-rolls-in-to-practice-late-with-a-bad-attitude,-the-frontman-has-to-show-him-who’s-boss,-putting-his-junk-on-Dex’s-skins,-then-pulling-down-the-drummer’s-jeans-and-slipping-a-drumstick-