Although David did not have a ticket for the game, he said he expected no problems in obtaining one.

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Greenfield, though, thinks consumers are increasingly rejecting 3D, and choosing to see 2D versions of mainstreams films, due in no small measure to the fact that the 2D versions have lower ticket prices.

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"The fact that this individual showed up with a one-way ticket, purchased with cash and no checked baggage -- he should have been pulled aside, " said security expert Larry Berg, a consultant with Berg Associates.

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No matter, I thought, I have got a smartphone, and I hurriedly set about buying my ticket that way.

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