The Blow Out is a 1936 Looney Tunes cartoon directed by Tex Avery. The short subject features Porky Pig.
Porky doesn't have enough money to buy an ice cream soda. He sits on the curb sulking, while a passerby drops his cane. Porky picks up the cane and hands it to the man, and is pleasantly surprised when the man gives him a coin for a tip. He excitedly runs around town picking up dropped items for people and collecting coins from them. Meanwhile, a mad bomber on the run from the police leaves a bomb that looks like an ordinary alarm clock in front of a building. Of course, Porky sees this, but doesn't know it's a bomb, so he picks it up and tries to return it to the man. The bomber runs from the bomb, but Porky follows him throughout the city, until the bomber accidentally runs right into the back of a paddy wagon.