Tim, Eric, and Dr. Mark try to wrap their heads around flatulence.
Tim and Eric introduce Dr. Mark Laursen and discuss body odor.
Tim, Eric, and Dr. Laursen take a look at zits, boils, and lesions.
Tim and Eric, along with the help of Dr. Mark Laursen, get to the bottom of penises and vaginas.
Tim and Eric, along with the medical expertise of Dr. Mark, discuss solid bowel movements.
In our season finale, Tim, Eric, and Dr. Laursen take a deep dive into diarrhea.