Shifter linkage in a 2002 focus zx3, took me 2 hrs to break it off, 4 hours of dremmeling and 2 flex shafts burnt up to get the rest of it out, then retap it(its like 3ft below the top of the motor near the firewall. Access was like5x5" once you got your arm down there about 10" of work space.) and make a part that would work.
Had a bolt off an aspire rear brake that after 3hrs of heating,banging,etc on my driveway that was a solid sheet of ice i gave up and took it in. Took the brake guys 6hrs to get it off, guy wanted to keep it as a trophy. IIRC they welded 2 or 3 nuts to it to finally get it off.
I hate working on cars with a passion.
Muzzel brake on my noveske broke 2 armorers wrenches and the shop gave it back to me and said to bring it in in a week when they got a reaction rod...lol.