It's not quite that simple. There's a machine with a row of colored buttons, and one sign says "press the green button for a chocolate bar," while another sign says "press the red button for a chocolate bar," and a third sign says "press the blue button for a chocolate bar."
When children are old enough to read and push buttons, they're provided with a pair of glasses, which only permits them to see one of the signs. So they press the green button, or the red button, or the blue button, but nobody gets a chocolate bar. Some people speculate that "if you just press HARD enough, you'll get a chocolate bar," and point to an instruction manual that says something like "If you press with the force of a mustard seed, you'll get a chocolate mountain," or something similar, but no matter how hard people press, still nobody gets a chocolate bar.
Over time, stories circulate that people who lived thousands of years ago got chocolate bars all the time, but these days the machine (for whatever reason) doesn't dispense them any more. Even so, if you'll faithfully press the correct button, you're guaranteed to get all the chocolate you can eat when you die. It's difficult to confirm this, since nobody has returned from the far side of the grave with any details about how this chocolate is distributed, or what it tastes like, but lots of people believe it anyway. The prospect of no chocolate bar EVER is just too grim to contemplate.
Some people take their glasses off, and (noticing the numerous signs) speculate that there might not really be any chocolate bars after all. Some people try on their neighbor's glasses, and become convinced that they've just been pushing the wrong button, and doggedly begin to press the new button, and attempt to get other people to press it.
The green button people have begun telling a story about a "candy machine repair man," who will return one day and "fix" the machine so it will provide chocolate for everyone.
Some of us are skeptical...