He’s been instructed to recite a specific phrase in Latin when the Queen taps him with the sword.
However, when his turn comes, he panics and forgets the phrase. When she taps him on the shoulders with the sword he thinks fast and recites the only other phrase in a foreign language he’s committed to memory, “Ma nishtanah halailah hazeh, mikol ha’leilot”.
Puzzked, The Queen looks whispers to her advisors, “Why is this knight different from all other knights?”
(I wish I could take credit for this one. Saw it posted in a Jewish food FB group and got a great chuckle out of it).