Definition: In this task, you are given a Reddit post as a text. Your task is to generate a title for this text. The title should start with "TIFU by", followed by a situation that caused humor. The title should contain 7-12 words, ideally.
Input: Text: so a guy on craigslist locally was selling a 1982 mercedes benz 240d 4spd with a "blown engine" the pictures looked good so i went and checked it out, because he only wanted $650 and anyone that knows me knows i'm a sucker for w123s. 

i get there, verify there is no rust, check everything, a/c works, interior is pristine, drive the car a bit. i get back and the car is idling really, really rough and vibrating like mad, with large amounts of grey smoke chugging from the exhaust. (this is a diesel that was out of tune) 

i said to myself "all it needs is a valve adjustment" and started counting out bills. he then came up to me and said the car was no longer for sale. somehow he heard me over that diesel racket and i missed out on one hell of a bargain!!

the guy was not familiar at all with the om616 diesel engine... next time i should keep my thoughts to myself... 

lesson learned. stfu when looking at a car.

TIFU by accidentally telling the seller of a car what was wrong with his engine.