The category was 'event' and there were 17 blank letters on the board.
Host Pat Sajak asked a contestant named Rufus for a letter and Rufus asked for a T.
"One T," said Sajak as Vanna White put the single consonant on the board.
Within seconds Rufus announced his guess and he was correct.
Take your time and give it your best guess.
Now watch the clip and see if you would have solved this puzzle with just one letter.