For some reason, my usual airline (OK) serves business class pre-departure drinks in plastic cups. I've enquired and they said it has to do with some sort of safety law. I still can't understand what it's about, as they do collect the cups before take-off (and it's not cost cutting because in-flight they use proper glass ones including china mugs for tea). Guess it's a rule dreamt up by some stupid bureaucrat at the Czech Civil Aviation Authority or whatever it's called.