Dr. Gross Facts has 4 audiobooks on Listento.it, narrated by 4 narrators. The most-rated is I Rubbed My Smelly Feet on Your Stocking.

I Peed in Your Stocking is an educational, fun-filled, gross fact book all about urine. Learn what causes you to urinate, weird facts about urinating, fun animal facts about urine defense mechanism, and much more.
©2015 John Thomas Mattison (P)2015 John Thomas Mattison

I Barfed in Your Stocking is an educational, fun filled, gross fact book all about vomit. Learn what causes you to barf, weird facts about barfing, fun animal facts about barf defense mechanism, and much, much more.
©2015 John Thomas Mattison (P)2016 John Thomas Mattison

Oh snap, you just got a fart in your stocking. Whoever gave it to you is pretty awesome. Now take some time to learn some fart facts, like the speed of farts, who farts more - men or women, fart entertainers, yoga poses for passing gas, and other fun fart facts for someone's Christmas stocking. Oh yeah, you just farted on their stocking.
©2015 John Thomas Mattison (P)2015 John Thomas Mattison

Looks like someone rubbed there stinky smelly feet all over your stocking. Hopefully it doesn't smell too bad. At least now you can find out what makes your feet smell, what type of foot disorders exist, how bacteria can grow, and the record for the biggest, smallest, and smelliest feet - everything that you would ever want to learn about feet.
©2015 John Thomas Mattison (P)2015 John Thomas Mattison