Chuck Jones’ cartoons were known for characters with facial expressions but Tex Avery turned a pair of eyes into a character.
Mysterious eyes watch the detective trying to solve the murder in “Who Killed Who?” The detective realises something is up. The eyes try to hide to avoid detection but it doesn’t quite work. I like how the eyes stretch in realisation they are trapped then bang on the door.
The gag takes all of 11 seconds before Avery segues into the next one involving a ghost behind the door. Avery and writer Rich Hogan have picked up the pace from their work at Warners.