Spaghetti Bath is a segment featured in the third installment of T.H.I.S., Taken For A Ride. It features Andrew in a bathtub full of spaghetti, spooning it into his mouth while Joe provides a backwards, distorted voice over.
When played backwards, the audio is actually Joe reading the opening lyrics of "Taken For A Ride".
This segment was presumably inspired by the piece "Life's Spaghetti Eating" in Marvin's Mechanical Museum (seen at the 4 minute mark in the T.H.I.S. documentary episode).