Microbiologist Tim Call, 32, has made a disgusting discovery about cinema popcorn after testing it for any lurking grime – and it’s safe to say the five-second rule is out when it comes to dining at the cinemaMicrobiologist Tim Call, 32, has made a disgusting discovery about cinema popcorn after testing it for any lurking grime – and it’s safe to say the five-second rule is out when it comes to dining at the cinema