Banks failing and CDOs exploding would be two good examples; they’re rare if not nonexistent but if they start they may all flare up.

Also natural distribution assumes you don’t have someone trying to game the extremes to make money. If being seven feet tall resulted in billions we’d have people researching how to grow taller people.

You can see stuff like this in distributions of tax returns - many people will be unexpectedly clustered right below certain cut-off amounts.