Congrats! You made it through Part 1 and gotten through most of the nasty stuff. No more dog turds, puke eaters or lobster rape. Now we start in the late 70s and focus on botched sex change castration, roaches that live in teenager’s beehive hairdos and a maniacal mother that kills if you don’t rewind your videotapes. Today we talk about race wars, domestic film terrorism and that time Tracey Ullman picked up a water bottle completely hands free, as Slate presents Part 2 of “John Waters: The Prince of Puke.”