Very brilliant
You must realize some of these are from top companies. The fact that they are top companies is no mistake or accident. These questions are unorthodox, but that's why they're so effective. You cannot prepare for "A penguin walks through that door right now wearing a sombrero. What does he say and why is he here?". That's not in any book. Hence, who you really are, your true skills and work ethic, shines through.
Take Google's question: "How many cows are in Canada?". This is for a data evaluator role. Hence, I assume the person will need a strong base in statistics. This is a difficult statistics question, and an unexpected one. They may not expect you to give an answer, but if you can walk them through the process of obtaining the it, then they know you are good candidate.
