I just went to pay a parking ticket and I ran into this rigged survey on San Francisco’s city web site.
You’ll notice two things. First, the “Highly Valuable” radio button is already pre-clicked for me. That was considerate of them, wasn’t it? Second, notice that two of the three options are positive. That’s like saying, “Using only the numbers 3, 7, or 10, rate our service on a scale from 1 to 10.”