Comment Far more likely than You Think (Score 2) 213
I'm sorry, but the rest are either stacked with incredible/'winning-powerball-jackpot-two-times-in-a-row' level odds (e.g. asteroid strike)
Actually the odds of you being alive for an extinction level event, while low, are far higher that. The odds of winning the UK national lottery are about one in 14 million. The average life expectancy of a human is ~80 years in the western world so if the rate of extinction-level events only has to be one every ~1.1 billion years for the annual probability of one to mean that there is a higher chance of you being alive when one happens than there is of you winning the lottery.
If you look at the frequency of all mass extinction events given here then you can see that the rate is far higher than that. Unfortunately we don't really know for certain how many, if any, of these were caused by asteroid impacts or massive volcanic eruptions but the rate of these natural extinction events is clearly far higher than one every billion years. Hence the data suggest that you are probably many times more likely to be alive when a natural mass extinction event happens than you are to win the lottery even once, let alone twice.