Yep. It's a grand old "bot check". They even mess up the words (stuj ekil tihs) to be extra careful.
Just got me today too. And I googled the question, so it also got google.
What color are the petals on a suflnower?
Well guys, I think I've found the official uniform of Mturk workers.
No. But @ChrisTurk believes it's because of other people in your area taking the surveys too.
Separate names with a comma.