Incorrect bladder control. Go and stand next to nearest dog, after a while, complain to dog's owner about the lack of house training. Demand a pint as compensation. You are looking through the bottom of an empty glass. Find someone who will buy you another pint.
Air turbulence is unusually high.
May be due to darts match. Insert broom handle down back of jacket. You are being carried out. Find out if you are being taken to another pub. If you're not, complain loudly that you're being hijacked by the Salvation Army.