IDK, I spent plenty of time around a watercooler and I don't recall something like this happening even once for me or people within my earshot.
The one thing I saw that actually works like that metaphorical watercooler is going to a bar and drinking together, or engaging in a similar activity that involves relaxing and unwinding. Of course, that's not something people feel comfortable about, plus it comes with its own set of issues and exclusions around time, family and alcohol, but that's the one type of situation I saw where people actually have those serendipitous productive interactions managers dream about.
The one thing I saw that actually works like that metaphorical watercooler is going to a bar and drinking together, or engaging in a similar activity that involves relaxing and unwinding. Of course, that's not something people feel comfortable about, plus it comes with its own set of issues and exclusions around time, family and alcohol, but that's the one type of situation I saw where people actually have those serendipitous productive interactions managers dream about.