The Trap Door Sezon 2 Odcinek 5: Not Very Nice

Berk is upstairs cleaning Him Upstairs's eyeballs when he accidentally drops one and it ends up falling down the trap door. Berk in his endeavours to find it falls over Drut and falls down the trap door. He goes looking for the eyeball and eventually ends up in what he thinks is a cave but is in fact a creature's mouth. The creature spits out Berk with the eyeball and they land back safely in Berk's room. Berk is relieved that Him Upstairs didn't see he had nearly lost his eyeball... or did he?!