I do remote gamedev with an artist friend. This type of conversation really only happens during long calls. Usually I'd call to discuss a problem and when that's done, we usually stick around some more to chat about random stuff, bounce jokes around until we somehow stumble upon cool ideas.

I think what makes it work is that since we just finished straining our brains to solve a problem, the relaxed post-discussion time helps refresh the brain and allows for fresh ideas to subconsciously come in.