"Louie, the Lilac"
After knocking out Batman and Robin, Louie ties them up and puts them in his hothouse, where his man-eating lilacs lie in wait. These vicious flora intend to ingest the Dynamic Duo through their tentacles, and Batman's utility belt is the first to go!
Batman is able to free one foot, and there is a flowerpot right next to it. He nimbly lifts it up and kicks it through the window of the hothouse door, exposing the Brazilian plants to the cold Gotham air, killing them instantly.
Louie the Lilac tries to take advantage of a bunch of innocent hippies.