At the supermarket an elderly lady needed to pay one dollar at the counter. She mistook a hundred-dollar bill for a ten-dollar bill and gave the hundred-dollar bill to the cashier. The cashier returned nine dollars to her. The cashier ripped her off for ninety dollars!
rip somebody off for something「白吞」就是佔便宜的意思，如「超商店員白吞了一個老婦人的錢」。rip somebody off 是一個人吞另一個人的錢的最好的說法之一
If you got severely injured and became a vegeable would you want to keep living?