When characters just don’t know how to communicate or share information at all.
Have the writers ever talked to people? We overshare everything. People well spend 30 minutes explaining a story that could be told in 10 seconds. No one is withholding critical information from their companions in real life to move a plot along.

Billy: "Feelin' good, Louis!"
------dialogue in this scene from "Trading Places." (1983).
#11 Probably not the right gif for this caption's context. That's Elwood gesturing for the waiter to fill his water glass with champagne in "The Blues Brothers."