what can I say, what havn't I done?
When the coolant lines in my trans went (On the union joins to the trans) I got frustrated with them and ripped them out, litterally as they were stuffed I just yanked em out and stuffed them all up.
Then discovered I couldn't get the new ones in without dropping the exhaust and steering rack, oh well off to the mechanics.
I got a rubber hose and connected it from one to the other, lucky it was a short drive or it would have cooked.
Next one would be I did an oil change and forgot to put some liquid gasket on the sump plug (As mine leaks if you don't use it) 2 days later I discovered the leak and remembered. Oh well Flushing oil??
recently I was taking my battery out stupidly positive cable first. spanner hit the body and $300 odd dollers later I had the BCM replaced and all was well again.
I like a few others here once bought an EA falcon, dumb idea, the head gasket went.