This is a fun video of an inpromptu disgorgement. It’s known as disgorgement à la volée (flying disgorgement), and it’s used for sparkling wines when people want to try them before they have been through the disgorgement stage.
This one is a pet nat (methode ancestrale sparkling wine) at Marc Delienne in Beaujolais. The dead yeast cells have been collected in the neck of the bottle, and the trick is to let the pressure force these out without losing too much wine.
Here, it doesn’t go so well: there are clearly lots of nucleation sites in the bottle and it fizzes up much like Mentos in coke (Mentos have lots and lots of nucleation sites, which cause rapid bubble formation).