Expensive giggle
Expensive giggle! 

The Teatreneu comedy club in Barcelona is trialling facial recognition technology in order to charge visitors on a per laugh basis. Screens on the back of the seats will register each time the audience member laughs. Laughs are charged at €0.30 (23p) and the total spend is capped at  €24 euros. Teatreneu says takings are up so far. Read more: bbc.co.uk

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