Matulovic-Bilek, Sousse Interzonal 1967, position after Black's move 37...Qc3-c6.
White now played either 38.Bf3?? or 38.Kg1, depending on how you look at it.
Graham Clayton on Chessville explains:
Matulovic played 33.Bf3??* and before Bilek could play 33...Rxf3 Matulovic put the Bishop back on e2 and played 33.Kg1.He explains:
[Matulovic claimed] that he was merely adjusting the pieces on the board (J'adoube). His opponent, Hungarian GM Istvan Bilek complained to the tournament director, but no action was taken. The game ended in a draw. After this incident, Matulovic was given the unflattering nickname of "J'adoubovic".Playthrough Matulovic-Bilek
[* = Clayton has the move numbering wrong here, but the account of events is, I believe, otherwise accurate - ejh]