In the film, a giant, gentle mouse named "Mr. Jingles" becomes a beloved pet of the prison guards. Tragically, he is accidentally killed when a guard throws a bucket of garbage into the disposal, unaware the mouse is inside.
This event is particularly poignant and memorable in the film due to the emotional connection the characters develop with Mr. Jingles. It highlights the themes of innocence, cruelty, and the fragility of life.