In 1967 my mother and I went to EXPO67 in Montreal . It was a great experience for me as the Russian pavilion was chock full of "we got this space achievement first" displays , the Australians imported a herd of kangaroos and there were numerous entertainments at other pavilions. But to this day my mind goes first to a guy with great chutzpah and a portable canning set-up . He was canning and selling ... wait for it ... genuine EXPO67 air . Hard to fault him on advertising either as he was canning it on the spot , you got just exactly what was on the label . He was having a hard time just keeping up with the demand as well , loved it!