Let’s say, that a scientific community has a consensus. For example, that 2000 years ago people always navigated near shores, just to be on the safe side.
Archaeologists, historians and every book on the subject — they should know their own field, shouldn’t they?
But you take a ruler and draw the shortest line possible between two mayor ports on either side of a sea and say: Here they’ve traveled!
Then you continue with your arrogance, saying: I bet they drank the wine they were transporting there, and I bet they threw empty bottles over board.
Let’s say you then take your ship across the line you drew and find unprecedented amount of empty ancient bottles under the sea, just where you predicted they were going to be.
Robert Ballard did this. Another great smartass in a honorable line which made this world an interesting place. Without them, everything would stay boring, as it use to be.