On the topic of tickets, I've kept a plane ticket from the year 2000, and it's a bit amazing that a decade or so after needing to go a travel agency and getting a booklet (plane tickets back then had a page for each leg, usually a back cover and maybe a front cover), I can just use my phone to go to the airline's website (or a price comparison site), buy a ticket, do online check-in, and just load up the barcode to board the plane...