NOT KNOWN FACTUAL STATEMENTS ABOUT LAUGHING GAS

From the Betty Boop cartoon "Ha! Ha! Ha!" opens with supposedly Max Fleischer's hand drawing Betty Boop with a sheet of paper. When Max leaves the studio, Koko comes out on the inkwell for the very last time, and commences eating the sweet bar Max experienced remaining within the table. Shortly he develops a toothache, so Betty draws a dentist plac