Julianna's Nemesis

It's minuscule.

It moves at a snail's pace.

It wakes her up at 4am.

It's not witty but it certainly is sharp.

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Here's a hint:

A villan usually comes under the cover of darkness, but not this pearly white culprit!

(Like I said, it's minuscule, but Jules will definitely let you know it's there!)