In article .com,
Boltar writes

there seem to be a lot of
people (usually women it has to be said) who walk up on the left and
then who for reasons best known to themselves stop just before the end

They've probably just remembered they need to retrieve their ticket or
oyster card from their vast handbag.

It's the same in supermarket check out queues: the person in front of
you will wait 10 or more minutes to be served, but only begins digging
around for their purse after the cashier announces the total spend.
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