The recent topic of "are you a f**k up" got me inspired for this one, as they often go hand in hand....
Had an old ford boonga for my first car, it copped a flogging[}:)]
When the exhaust started coming loose, simply wired it to the chasis with a coathanger

and plugged the holes with that knead it metal. when the back tailights got smashed, we used red cellophane to bodge em up and i even think the back bumper was held on with fishing line.
Tranny change on another car of mine, i screwed the metal fluid lines, managed to cut the twisted bit out and replace with some high pressure hose and a couple of hose clamps....dodgy.
Others have been using fibreglass resin to patch an ally boat, sewing up a custom para anchor out of a tarp, the list goes on...................
Im sure there must be some epic ones out there.......so go on....fess up.