A Curious Question, Captain
I think the exchange used to go something like this.
Data: A curious question, Captain.
Picard: Data, Data. All questions are curious.
Data: Ah, deciphering redundant statements is beyond the scope of my programming.
Picard: Well? I haven't got all day. Their are children for me to make mean faces to.
Data: What is this? (holds out hand)
Picard: What is what?
Data: This. (moves hand)
Picard: There's nothing there.
Data: This, Captain. (moves hand again)
Picard: That? Your hand?
Data: Ah, a hand. Thank you, Captain.