What is the kinkiest action you've ever done?

I know this can be a bit personal to answer, so feel free not to respond if wishing not too. But whether you were solo, or with a partner, what is the kinkiest action you've done that you thought might have been way off the wall to do? (if any)

Myself? .. I had sex while driving downtown Manhattan, NY city ... I know it was a bizarre thing to do and a crazy experience too, but this was back many years ago and no turning back on it now. Today I would never do that!!