1) This is what happens when you pop acid before starting a project.
2) He wanted a guitar where both ends could work as a boat paddle.
3) Someone said, "I dare you to [...]" and this is what resulted.
4) Leave the guy alone, he was really proud of this when he showed it to his psychiatrist. The guy who thinks he's Abraham Lincoln over in the corner still plays it during pudding time.
5) It's his homage to Salvador Dali. (extra points to everyone who gets this joke without having to look up Salvador Dali).