the rule, not the joke
GM Topalov adjusts
“Jadoube” is a key word in chess. It is used to inform your opponent that you do not want to move your piece and overrides the rule that touched piece should be moved.
J’adoube is a French word and stands for “I adjust”. It is internationally recognized and used in all tournaments. Many funny anecdotes can be found about “Jadoube”, as the one about GM Milan Matulovic. There is also the classical chess joke about jadoube that every chess player loves.