Johnny Knoxville, you've been gone too long. Good to see you again, buddy. You and all of your "Jackass" pals. The first trailer for "Jackass 3D" was unleashed across the Internet today, compliments of MySpace. You'll either laugh at what you see... or you're a corpse. Even if "Jackass" isn't your thing, there's absolutely nothing that isn't funny about seeing someone knocked off of their feet by a giant, spring-loaded hand. Or a jet engine. Good times.