有個工程師找不到工作, 就開了一家私人診所,
放了塊牌子在外面, 寫著『病治好，付$500；治不好，退$1000。』

有個醫生看到了這塊牌子, 心想這是個掙錢的好機會,
於是決定去一趟工程師的診所。

醫生: 我失去味覺了, 吃飯嘴裡沒味。
工程師: 護士, 把22號盒的藥拿來給病人嘴裡滴三滴。
病人(醫生)立刻吐了出來: 這是汽油!
工程師: 恭喜你, 你嘴裡的味覺恢復了，付我$500吧。
醫生只好付了錢, 很不爽地走了。



幾天後醫生又來到診所, 打算把損失的錢搞回來。
醫生: 我失去了記憶, 什麼都記不住。
工程師: 護士, 把22號盒的藥拿來給病人嘴裡滴三滴。
醫生: 這不就是上次的汽油嗎！？
工程師: 恭喜你, 你的記憶恢復了，請付$500吧。
醫生只好又付了錢, 憤怒地離開了。

醫生實在不甘心，幾天後又再上門，決心要把錢拿回來。
醫生: 我的視力很差。
工程師: 抱歉！我沒有什麼藥治這個病，這是退給你的$1000....
醫生: 可這只是$500!
工程師: 恭喜你, 你的視力恢復了，請付給我$500。

An engineer who was unemployed for a long time decided to open a medical clinic.   He puts a sign outside the clinic:  "A cure for your ailment guaranteed at $500; we'll pay you $1,000 if we fail."

A Doctor thinks this is a good opportunity  to  earn $1,000 and goes to his clinic.

Doctor: "I have lost my sense of taste."

Engineer:  "Nurse, please bring the medicine from box 22 and put 3 drops in the patient's mouth."

Doctor: "This is Gasoline!"

Engineer:  "Congratulations!  You have got your taste back. That will be $500."

The Doctor gets annoyed  and goes back after a couple of days later to recover his money.

Doctor: "I have lost my memory, I cannot remember any-thing."

Engineer:  "Nurse, please bring the medicine from box 22 and put 3 drops in the patient's mouth."

Doctor: "But that is Gasoline!"

Engineer:  " Congratulations!  You've got your memory back. That will be $500."

The Doctor leaves angrily and comes back after several days, more determined than ever to make his money back.

Doctor: "My eyesight has become weak."

Engineer:  "Well,  I don't have any medicine for this. Take this $1,000," passing the doctor a $500 note.

Doctor: "But this is $500..."

Engineer:  " Congratulations!  You've got your vision back! That will be $500."