Where do I start??? Two of the better ones....A few years ago I was trying to replace the steering bellows on my old TR8 and needed to remove the balljoints (without the proper tools of course.) I figured a smart tap with a hammer would free it. It might of except I missed and managed to scrape off the threads and then could neither take it apart or reassemble it. Since it was Sunday and I had no hope of getting the parts I wired it all together and drove at about 2 MPH to a nearby tire shop and had them bail me out.
The other ooops relates to my bad habit of leaving tools lying around the engine compartment. Once after a valve adjustment I started the engine and a wrench went flying by....I have no idea where I left it to cause it to fly so nicely but fly it did, fortunately with no damage done.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold