I can't remember if it was the exact same procedure, but I've had something very similar when I had a bladder biopsy done, but I'm going to beat you on making someone else uncomfortable :D

For anyone who doesn't know, these procedures start with an anaesthetic gel being squirted into your penis through a syringe to numb everything, then the camera and tools get inserted. It's been a while, but from what I remember, some air gets pushed in along with everything else. The nurse warned me that the air coming out can be uncomfortable. I also had to have a pretty full bladder for the procedure.

Afterwards, I needed to pee straight away, so used the toilet next to the waiting room. When I went, it burned a bit from the gel wearing off and everything just generally being tender. Suddenly though, I had this feeling of intense pressure, and a fireball forced its way out followed by some boiling pee. I used my free hand to steady myself, and my knees almost buckled. I let out an involuntary 'Jesus Christ!'. I finished and cleaned up, and the nurse met me outside the door.

She had a huge grin on her face, and said 'I told you it would sting', then nodded towards the waiting room, where about half a dozen terrified looking men had apparently heard me :D

Ok you’ve got the price

"Jesus Christ doc, stop fucking sightseeing and wrap it up!"

Do they fill it full of water like they do for the kidney scan? That was super uncomfortable, but kind of cool to see on the monitor...