The idea popped into my head yesterday and I just cant let it go for some reason.

Robert the Evil Tire (Small construct) AC 13 (made of rubber) HP: 35 Movement speed of 60 since its a tire. Blindsense 60 ft Immune to charm, fear, poisoned, Resistant to nonmagical bludgeoning damage, vulnerable to fire and piercing damage

Str 5(-4) Dex 15( 2) Con 14( 2) Wis 10(0) Int 20( 5) Cha 3(-4)

Detonate: 30 ft range 7 to hit. Does 6d8 4 (31) Psychic damage. If a target would be brought to 0 by this damage, their head explodes. Otherwise target is stunned for a round.

I know it isnt perfect by any means, but if anybody here has seen the movie and has anything to add, please feel free to give me some recommendations!