"Thundercrack!" is a picture about sexual insanity from Curt McDowell, his friend George Kuchar, and Mark Ellinger. "Sparkle's Tavern" had a sociopolitical sincerity, personality and structure that isn't present in this, despite similar themes and casting. Most scenes in "Thunder" consist of nonsensical conversations in cramped places where ambiguous, experimental acts take place. It's not as fun as it should be.