Rock, paper, scissors, chainsaw

[Jplus]

I'm a bit surprised this one had not been reinstated yet. You post something that defeats the previous post.

Garlic.

[ratammer]

My mum (she eats a lot of garlic).

[Jplus]

AlphaGo (at playing Go. Admittedly, I'm not sure that your mom isn't a stronger player, but the odds seem favorable.)

[ratammer]

Captcha (stops any AI in its tracks)

[Freddino18]

Robotic arm with a pencil (Can click the mouse)

[ratammer]

Teeth (break the pencil)

[Freddino18]

Hot coffee (Shatters them because they are too cold)

[ratammer]

Milk (makes the coffee too weak)

[Freddino18]

Stick (churns it into butter)

[Jplus]

Termites

[Freddino18]

Army ants

[Jplus]

Cyanoacrylate superglue

[Freddino18]

A moderate shear force

[Jplus]

Clamp

[somitomi]

A carpenter's hand

[phillip1882]

a nail

[Jplus]

Carpenter's pincers

[The Snide Sniper]

A slab of concrete

[Jplus]

Fluorine

[The Snide Sniper]

Nickel

[phillip1882]

dime

[Jplus]

one of those muscle-powered machines that turns coins into souvenirs

[somitomi]

a steel washer

[phillip1882]

a screw

[Jplus]

the Sun