Agree with Gou... last security clearance through LHR was delayed even further by a passenger who was held up after being told he couldn't talk his 2 litre bottle of water onboard.
He then decided to drink it all before proceeding - refusing anyone else to pass by him. Nice.
A mini-riot ensued getting a number of people departing the scene highly aggravated.
What are my rights to not have to deal with moron passengers?