An abrupt, interruptive, correction to someone who believes they are 100% right about a subject, or course of events.
(Must be followed with the actual Truth.)
(Works best when you point and say it loudly in the middle of their sentence.)
Excited woman says: "I just bought this Louie Vuitton bag for $20! What a deal! I cant believe that I ..... " "WRONGO! ITS A FAKE!"... said by a truthful male while pointing.