The joke in episode 2 with the restaurant toilet was so contrived
So they're sat at the table and they make a mini issue out of the fact that he needs to go to the loo (make sure you knock because they're unisex toilets). So why then, when she knows that he's going to the only toilet in the place, would she get up and start banging on the door 30 seconds later just to wash het hands?
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