It seems the deductive* powers of many are extraordinary. Take this situation; there are 6 closed boxes on the table. You open the first and find a cauliflower. You open the second and find a cabbage. You open the third and find a carrot.
Pictured:
Zucchini is another vegetable that starts with the letter C
We are halfway through the boxes. To digress for a moment - people look for patterns. They look for order. They apply their learnings and make what seem to be objective deductions. But we'll still get different opinions. Vegetables? Things starting with the letter C? Vegetables starting with the letter C?
We open box four. Potato.
OK. Well, it's vegetables then.
Box 5. Lettuce.
Yep, case closed. Vegetables.
Do we need to open box 6? Some people don't bother at this point. But we will be thorough. We open box 6. An apple.
Yep, it's a vegetable. At least that's what many people would have you believe.
--Zen
* Deductive, in the general sense, but more accurately, an issue of inductive reasoning, as David points out below.