Shrek - I Feel Good (lost animation test; 1996)
Shrek is a 2001 computer-animated film directed by Andrew Adamson and Vicky Jenson, based on the book of the same name. However, production for the film dates back to around 1995, when Chris Farley was originally cast as Shrek. Around this time, Dreamworks made an animation test featuring an early version of Shrek. It is currently unknown how long the animation test was.
As of now, all that's known about the plot is that Shrek enters a gated city at night, singing "I Feel Good". He comes across a 'Mugger' tied to a rope, who was singing along with Shrek. Shrek proceeds to play with him and then stretches the Mugger on his rope, and sends him soaring into the night sky.
Very, very little info has come up on the topic, and all that remains of the original animation test are images. It is currently unknown if any employees at Dreamworks have this animation test, or if the test was destroyed.