Fearsome Foot

A scary character is approaching, and the camera focuses on his/her foot crushing something, or just emphasizes the is frightfulness with a closeup of the characters feet/boots, which may be adorned with Spikes of Doom or the like. Very common for an Attack of the 50-Foot Whatever.

Subtrope of Foot Focus, but in a scary or Badass way instead of a sexy way. Differs from Feet First Introduction in that it isn't necessarily the first appearance of the character.

Examples of Fearsome Foot include:

Film - Live-Action

In the Thor film, there's a closeup of the Destroyer's foot as it enters the town on Earth.
In Predator 2, the shot of the monster approaching a doomed gang leader is taken from behind its feet.
In Jurassic Park, the approach of the T rex is once shown by its foot coming down into the shot and sinking into the mud.
In The Empire Strikes Back, the first we see of the AT-AT walker is its foot stepping down into a rebel sentry's view.

Live-Action TV

Played for Laughs with the opening animation of Monty Python's Flying Circus.