This is the (currently sold out) Archaeology Soap (technically Paleontology Soap, come on, get your shit together) made exclusively for ThinkGeek by Outlaw Soaps. Each $17, three-inch cube of soap has three distinct layers of strata and "pumice mixed into the bottom layer and bentonite clay in the second layer so the 'ground' will wear away differently." Plus each bar has two plastic dinosaur toys hidden inside for EXTRA exfoliation/scraping and bruising. I was actually lucky enough to get a bar, and I've got to admit-- "You put the dinosaurs in your butt." I didn't PUT them there, they just happened to go play inside when I was scrubbing between my cheeks.
Keep going for a couple more shots.
Thanks to Lydia, who agrees somebody should make a bar of soap with real dead bugs inside for freaking out your roommate/significant other. Man, we're full of great product ideas, aren't we?