Interesting. Given the questions:<p><pre><code> Which brand of laptop seems bigger, Detal or Dutal?
Which brand of vacuum cleaner seems heavier, Keffi or Kuffi?
Which brand of ketchup seems thicker, Nellen or Nullen?
</code></pre>
The first question may have affected the answers to the others. "Dutal" may trigger an association chain "Duty" -> "Heavy Duty" -> "Large", and then naturally all the other answers should be consistent with that one. Is there a mechanism scientists use to defend against such a "snowballing" effect?