Willard (2003)

Haunted by loneliness, Willard finds solace in the unlikely company of rats infesting his inherited, decaying estate. These creatures offer respite from the torment inflicted by his overbearing mother and the callous Frank, his father's former associate. However, Willard's sanctuary morphs into something far more sinister. The burgeoning rodent colony displays a chilling loyalty, eager to unleash a brutal, merciless vengeance upon anyone who dares to mistreat their vulnerable benefactor. A disturbing alliance is forged in the shadows, promising a reckoning soaked in fear.