I was a seat away from a guy who had weird growths the size of apples all over his body ranting to himself about how the Jews are secretly controlling Australia and that in summer women shouldn't wear clothes.
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Not so much weird as entertaining. I was in Chile in 2009 (Santiago) and it was the day after Chile had won the match which qualified them for the Football World Cup. I was doing the tourist thing and walking down a very vacant Bernardo O'Higgins Avenue (the main drag). This long articulated bus drove past me, which was completely empty with the exception of one chap who was located at the back row of the bus. This chap was standing up and had his head out of an open window. He was vomiting one very long and consistent stream of a murky brown substance which was splashed against the outside back corner of the bus. Good times. Good good times.