Affliction where one can walk into a situation completely unaware of the current state of play, and comment instantly, and often with great accuracy on present dealings.
In this situation (where Stoichkov Syndrome was first diagnosed), 3 people are discussing the European Football Championships, #2 and #3 have successfully named 15 of the 16 participating nations without naming any wrong teams, and #1 conducting the quiz presses them for the answer to the 16th (Bulgaria), offering a clue...
#1: "One of the greatest footballers of the past 20 years hailed from this nation."
#4: (joining the conversation from an entirely neutral standpoint, having only heard the clue offered)
#2 and #3: "Bulgaria!"
#1: "Yes! Incredible!"