When lightning strikes merlion, people say very bad omen - the world is coming to an end. But it didn't.
When Marina Sands was built, people say very bad omen, but Sands is making money and laughing all the way to the bank.
When one tree fell by strong wind, people say bad omen. When two trees fell, people say very bad omen. When three trees fell, people say very, very bad omen.
When is omen going to be an omen? The world is coming to an end, that's for sure. But you and I won't be around for the next 1000 trillion years.
Should you have constipation or diarrhoea, it's sure is a bad omen for your body - better see a doctor.