The odds of winning the lottery compared to other things show the scale best. The chance of being struck by lightning in a given year is often put near one in a million, several times better than a typical jackpot ticket. Being dealt a royal flush in five cards is about one in six hundred fifty thousand. Set against those, a big draw sits in the company of events most people never expect to meet in their own lives.
Some comparisons go further still. The odds of winning the lottery against being born at all, with one particular set of parents meeting and one particular cell out of billions, are a favourite thought experiment, and they flatter the lottery only because the second number is so absurd. The odds of winning the lottery twice are the jackpot odds squared for any one person, though across millions of players someone somewhere will now and then win a second time.
Chances of winning the lottery if you play every day grow slowly. One ticket a day for fifty years is about eighteen thousand tickets, which against fourteen million combinations gives your lifetime chance of the top prize at roughly one in eight hundred. A lottery odds breakdown by tier makes the same point from the other side: nearly all the money returned goes to small prizes, and the jackpot is the rarest line on the table.