A good story for a nerd party

At one time, the English language had four letters not found today. Only one of those letters survived into Middle English (i.e. the time of Chaucer), the letter ‘thorn’, written as ‘Þ' and pronounced as ‘th’. Eventually this letter was modified by scribes so that it looked like ‘y’ (I’ve also heard that the first printing type in England came from continental Europe and didn’t have a ‘Þ’, so the letter was replaced in printing with ‘y’.....I don’t know which story is true, although the shift in the character definitely happened). That’s the origin of the mock archaic word ‘ye’ as in “Ye Olde Curiosity Shop”; because the ‘y’ was really a ‘th’, the ‘ye’ should actually be pronounced ‘the’.