The Pain Transference Helmet was an invention created by Jimmy used for transferring pain to someone else when the user puts the helmet on; making the user not have any pain when hurt.
Jimmy used this invention to not get pain while at the dentist and Cindy ended up getting the pain when it was transferred. A few days later Cindy stole the Pain Transference Helmet and payed back Jimmy by flicking her nose, stretching her mouth, and Libby kicking her bottom so that Jimmy got the pain.
It only appeared in Pain, Pain, Go Away!