When the Na'vi tread through it, the ground lights up beneath their feet (I kept waiting for someone to break into a chorus of "Billie Jean").

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There were others waiting and I kept thinking I should go - especially when she loosened her grip a little.

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"Excuse me, your honor. may I remind the court that Mr. Shapiro kept the court waiting for 20 minutes showing up at 20 after nine when it was his witness on the stand and suffered no sanction, " said Clark.

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You will have your own favourites, but I always liked the Traffic Light Tree in London's Docklands, a bewildering display of red, amber and green which kept me waiting, transfixed and tense, for really quite some time when I first encountered it.

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