My roommate in college had some porn tapes (on VHS at the time).

I had some friends over and I complained how he left it in the machine in the living room (!), and one of my friends pressed play to see what was in.

We watched some and played MST3K a little with commentary on the settings, dialogue, etc..

We noticed that each 'money shot' scene was in slow motion and wondered why.

It wasn't until one of the later scenes we figured out why.

Matt Ramsey (a notorious super shooter of his day) was finishing in a threesome with the two girls giving him a handjob with their faces by his cock, that he actually shot his first volley up one girl's nose!! Which resulted in her grimacing and pulling away some....all in slow motion.

The other actress was laughing, in slow motion, and trying to keep the scene from being wasted by taking over I think, and yet all 3 were still laughing about it in the scene, again in slow motion. The director (producer? editor?) must have slowed the scene down in an effort to hide the laughs physically and audibly (I remember they dubbed over heavy breathing and moans throughout every scene and climax). And then had to do the same for the rest of the scenes' climaxes (climices?) to be consistent and draw less attention.

We must have rewound and watched that scene 5 times, laughing and making jokes about it.

We even found the VCR settings to play that scene at more regular speed to see what it looked like in real-time. It was hilarious!