It must atleast contain Mr. Lazy and have two scenes (different backgrounds, different storyline). Each scene only has to last around 10 seconds as it only has to be basic.
A good example of one scene would be Mr. Lazy sleeping in the jungle, Mr. Sneeze walks up to him (motion tween, etc..) and sneezes on him, causing him to wake up in a rage.
The animation must also have a basic sound track overlay throughout all the scenes.
The flash .fla + .swf file, including any images / resources used.