OTOH I once heard the total opposite down near Miami. Miami Approach is VERY busy most days and one afternoon the controller was pretty obviously about to have a breakdown right there on the air. Out of both human kindness and not wanting the controller to just quit and leave us with no ATC, everyone started answering calls with double-clicks instead of full readbacks with an occasional "good job" or "hang in there" thrown in. The reduction in tempo allowed the poor guy to regain his composure and get back to normal.