The Lyin' Mouse

The Lyin' Mouse it's a 1937 Merrie Melodies cartoon.

Plot
A mouse is trying to free himself from a trap when a cat arrives. The mouse, desperate to avoid being eaten, asks if the cat has heard the story of "The Lion And The Mouse." He tells a story about a ferocious lion in the jungle who scares all the animals; the mouse has a horn that imitates the lion's roar, and has some fun with it until the lion catches him. The mouse pleads for his life, and the lion, distracted by a bigger catch, agrees. The bigger catch is a trap set by the Frank Cluck expedition; the lion avoids the first trap, but falls for the second, and find himself in a circus lion-taming act (where he put his head inside the tamer's mouth). The mouse happens by, and chews a lion-shaped hole in the lion's wooden cart/cage, setting him free. Back to the cat: moved by this story, he releases the mouse. Just before entering his hole, the mouse yells one last word at the cat: "Sucker!"