Whirrel Call - S1.E39

While picking on a Whirrel named Ed, Entree and his victim fall off a cliff. The landing causes their brains to pop out and rebound into each others' heads. Entree quickly enjoys his new life as a Whirrel, and the unassuming Peri enjoys Ed's pleasant attitude. Entree is then ordered by a group of Whirrels to kill himself for his crimes against Whirrel-kind.