An optician was trying to convince a woman that she needed a new pair of glasses.
"Hmm... that's not necessary," she said.
"Okay," the optician challenged her, "what does it say on the store window across the street?"
"Well, it says: 'All merchandise - 40% to 50% off'."
"Incredible, you're right!"
"Of course!" she said. "I never miss a sale!"
Two colleagues were having a conversation.
One of them complained, "I've become so short-sighted, and I can't afford to buy a new pair of glasses, so I almost worked myself to death."
The other asked, "You worked yourself to death so that you can earn money to buy a new pair of glasses?"
"No, I couldn't tell whether the boss was watching me or not, so I had to work all the time."