About No Time for Nuts
Scrat, the saber-toothed squirrel (an unknown animal but supposed extinct), while trying to find a place to bury his acorn, finds a buried time machine next to the ice-encased body of a time traveller who appears to be Albert Einstein. He accidentally activates the machine, sending the acorn to somewhere. Scrat gets mad and tries to beat up the time machine but it sends him to the Middle Ages. After the acorn becomes wedged under a rock, Scrat uses The Sword in the Stone as a lever to move the rock. He pulls out the sword but now finds himself under attack by a group of unseen archers. He grabs the acorn (now disloged from the rock) and time machine and races off to find cover, only to hide in the barrel of a lit cannon, which fires him into the path of the incoming arrows. The time machine teleports the acorn and Scrat manages to activate the machine just in time.