Quite a few, actually. Not via SGEEA, say, but by casting a particular skill.
The Vampyric Forms are examples.
I taught KoLmafia that you can undo Mist Form by casting Mist Form.
Works fine. You even get a link in the charpane that you can click to uneffect it.
However, on the Skill Casting page, if you select Mist Form and click the Uneffect button, it says:
Mist Form is an intrinsic and cannot be uneffected.
That button needs a bit of larnin'.