Overweight Passengers

Have you ever crossed the Atlantic or flown from New York to Las Vegas / Los Angeles sitting next to an overweight person? It happened to me on a flight from New York to Buenos Aires and I had to make a big objection to get the attention of the flight attendants and the Captain to find me another seat - it is the most uncomfortable situation you ever encounter.
If people are so big that they are not able to fit into an airline seat, then they should be asked to buy two seats - you cannot expect the passenger next to them to pay the price!

(USA)