This was Board 1 of a recent ACBL tournament and North is the dealer, but before North made a call, West pulled the 1♣ bid-card from the box, then hastily replaced it. The other players saw clearly that it was the 1♣ bid-card, but it did not meet the requirement for a bid made under the bid-box regulations the ACBL uses. I was the TD called and I carefully instructed East that he had unauthorized information -- the knowledge that his partner was about to open 1♣ was not information he could use in choosing his own calls.
The auction was short and sweet: pass from North, a gambling 3NT from East, duly alerted as such, and three passes. I was standing behind West so I did not see East's hand. When the auction ended I left quietly to look at the hand records, and not too surprisingly was called back when East claimed ten tricks (having lost the king of clubs and two aces). What now?