Bowel exam. I swear, I'd never even considered the possibilities of attaching a camera to a stainless-steel sex toy before.
And local anaesthetic into a hand. Take a LONG needle, and starting at the blade of the hand, push it all the way in until it's about at the base of your thumb. Inject with a good shot of anaesthetic, and watch your hand swell up like a balloon. And then repeat if they miss the nerve centre - by this time your hand will be double size with the volume of liquid injected.