Down in Argentina you can visit Iguazu Falls. It’s sure to be wet. There is a boat ride to the falls. They give you a ‘wetbag’ to store valuables, that would be expensive cameras. Take the picture or not, it’s your choice. We did. And it was raining all day. I mean umbrellas couldn’t save you. David, Lisa, and I did the best we could. Dry was not possible. At lunch it was quite an experience to enter an air-conditioned dining room and to see condensation inside the lens of all the cameras (3). Fortunately the water evaporated and nothing more could be seen of any water damage. But it was scary for a moment. No waterproof diving camera in those days.
Yes, this is not a special effect. This is condensation in the camera at lunch when the A/C caused the vapor to fog. It cleared in less than an hour. Dumb luck or crazy!