You're a Sap, Mr. Jap is a 1942 one-reel anti-Japanese Popeye the Sailor animated cartoon short subject released by Paramount Pictures on August 7, 1942.

The Japanese man then slips through his kimono (it is revealed that he is wearing a military outfit underneath) and runs into the hull, alerting his crewmates to emerge the rest of the boat out of the water.

Popeye then runs to the other side of the ship and finds a group of Japanese sailors hiding inside the remains of a cannon, so he kicks them into the water.

From inside of the boat's hull, a Japanese Naval Officer talks to himself and contemplates committing suicide because he is losing against Popeye.

You're a Sap, Mr. Jap is one of the few Popeye the Sailor cartoons not to feature Bluto, Olive Oyl, or Wimpy.

The film title gets its name from a novelty song written by James Cavanaugh, John Redmond and Nat Simon.

The film was unavailable for commercial release for years due to its racially offensive caricaturing of the Japanese.