Yeah.
I've used most of them as life lessons on how to avoid those situations in the future.
One of them was actually a discrimination accusation.
Female staffer had been talked into claiming the reason she had not been promoted further was because she was a woman. The guy who talked her into it was one of the Sr guys on my staff who wanted my job. I did not hire the guy, inherited him after an acquisition and his group got folded into one of the business units I ran.
HR calls me on the last Friday of my paternity leave telling me "don't go to your office Monday, come straight to HR, there's a problem but don't worry, we have the lawyers handling it already"
Told them they needed to tell me what was going on, they can't call me on a Friday and leave me hanging all weekend.
So they told me and when I heard it I laughed at the ridiculousness of it as I'd fought tooth and nail with HR for years over this persons advancement. They said a similar thing, they knew it was bull**** because we'd argued so often over doing the right thing by her.
By Monday morning she'd apparently realized she'd been played and went to HR to recant and spilled the beans on who put her up to it.
Needless to say we were having a company wide "thinning of the herd' coming up and normally it was up to me who got cut in my groups.
HR called up and said "you get to sit this one out, we've got your list for you already"
They did that so no one could accuse me of getting revenge.