So, it took me embarrassingly many shopping trips to remember to buy kefir. But I finally did. For reference, I chose Andechser Bio Kefir. But to be honest I didn’t find the lid dripping. I shook before I opened and it was still fine. Repeated that a couple of times. Decided to leave some for the next day, maybe the consistency would change after opening. Still fine. Then I decided to let it warm to room temperature and still no dripping.
So unfortunately I cannot reproduce the scientific findings of @frosch.
It’s been 8 hours. Either they ded. Or are too ashamed and embarrassed after getting covered in their drink.
I’m just too ashamed to admit that I went to the store to buy kefir like 5 times and each time bought half of the supermarket’s inventory but not kefir.
I finally did though. Cannot confirm the dripping, see comment above.