My closest experience was hearing it and dealing with the aftermath.
Back in the early days of our old video store, my buddy Dave recruited an old girlfriend to the house he was sharing with H&K to do a tickle shoot. We got her tied down to the cot in the basement, but when I set up the camera, I realized the batteries were dead. Dave came with me back out to the car to grab my power cord.
H&K stayed with the girl.
We were gone maybe three minutes. As soon as we stepped back inside, we heard muffled screams, laughs, and cursing.
The basement door had been closed and locked.
H&K was downstairs tickle torturing Dave's old girlfriend.
After much pounding, maybe five minutes later, the laugh-screaming stopped. Then we heard footsteps on the stairs, harsh things being said, footsteps returning, pleading and apologizing, and more laugh-screaming. Finally, H&K unlocked the door. She looked happy. Smug. Cute little grin.
Based on the shouting from below, old girlfriend was not happy at all.
We decided Dave would bundle H&K off to grab some takeout while I went down to untie OG.
I went downstairs to find a panting, rumpled wreck, but she was ok. I apologized sincerely. She was pretty angry, but reasonably cool about it, especially after I went ahead and paid her for the shoot.
Later I learned that she had been talking shit about H&K and telling friends she was planning to get Dave back. H&K heard about it with neither OG or Dave knowing, and convinced Dave to talk her into a shoot. H&K had always intended to torture her, but thought she'd have to soft-pedal it for the video...until we walked out and left them alone.
H&K was pretty hard core.
Too bad, too. It probably would have been an awesome video.