Changing a wheel on a Fiesta (not mine) and the Jack slipped, pushing a nice dent in the sill before the car came crashing down...
Doing an oil change on the Miggy, drained old oil, replaced the sump plug, fitted new filter, filled with new oil, started the engine, left to tick over for 10 minutes before reversng the car off the ramps... A strange crunching noise and I realised that I forgot to remove the bucket of oil from under the car...
Blanking the EGR and dropping a bolt straight into the back of the belt tensioner pulley... Removed said pulley, removed bolt, sheared pulley arm attempting to retension the belt!!! Replacement pulley arm sourced from a BMW specialist scrap yard as I couldn't find an Omega anywhere...
Changed the brake pads... Spent 2 hours trying to push the piston back, before realiseing that I was sitting on a G-clamp which enabled me to push piston back in 10 seconds...
Servicing Hand Brake... Removed caliper, did necessary work, replace caliper, put wheel on, noticed 2 bolts under where the wheel was... Yes, they were the caliper bolts...
After changing Brake pads, I had no hand brake as the cable had snapped.. I forgot to pump the brake pedal vefore starting the engine, car rolled backwards down the drive and redesigned my garage door with the Tow Bar!!!!
and lots more!!!