How about this analogy:
Greetings, sir! I understand you’re looking for a tasty treat. I can help you! Look, see my large jar of jelly beans? They are absolutely fantastic. In fact, just one of these jelly beans will last you your entire life.
There’s just one little problem. Forty two percent of the jelly beans in this jar are poisonous. Some of the poison jelly beans are fatal; the others will just make you sick for about 20 years.
Unfortunately, there is no way to reliably determine which ones are which until you take one and eat it. In fact, even the poisonous jelly beans are very sweet when you first taste them.
So, kind sir, what jelly bean would you like?
No thanks. Think I'll buy a Milk Dud instead.