Futurama had the original "I am not a robot".
Which of the following would you most prefer?
A: A puppy,
B: A pretty flower from your sweetie, or
C: A large properly formatted data file?
There was also the offer a hot glue gun to fix Fry's leaky coolant which would probably give a definitive answer.
@spzb The correct answer is the file, but the flower would also have been acceptable