Fun related story.

My best friend was given a PIP from his manager. Company wanted him out for political reasons, told him he had to sign, except all of the reasons in the PIP were fabricated.

He stapled a page to the back before turning it in saying that he disagrees, but is required to sign, and thus wishes to comply with the requirement to sign.

They fired him immediately for refusing to remove the extra page, tried to deny him unemployment benefits saying that he chose to quit by not signing. The case went to unemployment court and he won. He got all his benefits, company had to pay a huge fine.