Nobody could quite believe what was happening - the two clients seemed to be trying to outdo each other.
One ordered five bottles of champagne, so the next one upped it to six, then to seven, and so on.
It was incredible. The men didn't end up drinking that much of it themselves - it was mostly consumed by the lady friends they had met inside on the night.
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The retrospective is so in-demand the museum will open its doors all through the night for the first time since it opened in 1857.