eBay item #7373643779 is covered in "mad person" warning signs. The description is written in block capitals, underlined, in italics, in green. Here's what it says: “This guitar has no strings or frets but little buttons to replace them and a synthesizer in the base to change the sound to anything you want." Apparently it was built in 1970 and is the only one in the world. No bids yet at $5,000 (Thanks, Monster Movie)