Impromptu

A loud meeting of indian workers just broke out on the train. One of them had an idea, then some spring-boarding, when suddenly dry-erase markers were out flying, and they are doodling on the train window. 

I bet they will remember this moment as "the spark" and tell the origin story for years if this works.

For everyone else, we are annoyed and wish they could, "table it," and "talk about it offline, later."