Cash Registers
One of the most hilarious ads on this list claims it made a whopping discovery by creating a cash register that “figure your change!” No more needing any math skills. It goes on to say, “these registers complete the cycle of protection for both customer and store. They show, at the top of the register and on the receipt, that every step of the sale is handled correctly.” That sounds like an intense discovery of that time, considering it’s completely obsolete nowadays. We’re happy with our iPhones and built-in calculators, thanks (Pinterest).