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You folks are right, on more than one level...

http://en.wikipedia.org/wiki/Manhole_cover" onclick="window.open(this.href);return false;

However, the point about a race car creating enough vacumn to lift a manhole cover is equivalent to aliens killing birds in AK.

Apadravya wrote:A non circle geometric shape if turned a certain way can fall through, I think.

I answered because it rolls better than a square. DUH!!

For all you deep thinkers out there, I had an interview question as follows:

Why are manhole covers round?

This should test your critical thinking / reasoning skills.