Flik is a bug that appears in Cars, starring in a film called A Bug's Life, of which the residents of Radiator Springs are watching during the credit sequence. He yells at P.T. Flea and his circus troupe, shocked at the fact that they are circus cars.
Flik is a Special Aphid GT. He is based off of the character of the same name from another Pixar film, A Bug's Life.