These are the Pokémon Snoring Snorlax Slippers designed and sold by ThinkGeek ($30). They make snoring sounds (they sound like Darth Vader breathing to me) when you walk thanks to two tiny speakers powered by non-replaceable batteries so when they die they become Snorlax Non-Snoring Snorlax Slippers. They're officially licensed Pokemon products though, so you can sleep easy(!) knowing Nintendo is getting their cut. I also saw some completely unlicensed knockoff Snorlax slippers on eBay and other places around the web for way cheaper, but they look like they were made in sweatshops so just don't be surprised if those fall apart after two days and the asbestos filling starts coming out.
Keep going for a couple more shots and a video demo.
Thanks to lizzy, who agrees snoring is nature's way of letting your mate know they made a bad decision.