So Joe Suspect is explaining to the cops where he was last night. As he speaks, we get a Flash Back showing us the events.
But wait a minute! What we're seeing on screen doesn't fit what the voice-over is saying. While Joe tells the cops he had to work late, we see him in a bar. And when he admits he went to see the murder victim, but they came to an amicable agreement, the flashback shows them [...] [tvtropes.org]