Mechanical Man is a 1932 cartoon short by Walter Lantz that features Oswald the Lucky Rabbit.

Without warning, Kitty gets captured through an opened window by the mad scientist who then leaves a sack inside before fleeing.

At the laboratory, the mad scientist has Kitty wedged in a vise and attempts to perform surgery on her, by taking out her heart and placing it in the robot.

Upon knocking on the door, a trap activates, causing him to fall into a chute, leading towards the basement.

In an attempt to slaughter Oswald, the mad scientist waits for the little rabbit's arrival at other end of the shoot, preparing to swing an axe.

There is indeed a skeleton innocently sitting on a rocking chair by the left corner, but the mad scientist, who was coming from the corridor in that direction, pulls it away, and walks into the intersection.

[3] A number of Oswald shorts and other cartoons produced by Walter Lantz Production also ended up in similar status.

The characters that starred in those versions include Mickey Mouse, Bosko, Scrappy, and Flip the Frog.