Many moons ago, I had an ancient, rusting 1000cc BMW bike, with rotting twin exhausts. Off for a weekend of alcohol-fuelled debauchery in the middle of nowhere at a mate's. Nearly there, then the end of one of the rotting exhaust pipes disintegrated and fell off. Arrived with bike sounding like a pneumatic drill. Mate looks at exhaust, strokes beard, disappears into garage. Much drilling and hammering ensues, then he emerges with a Fray Bentos Steak and Kidney pudding tin with a hole cut in the base and three holes drilled around the rim. Coats with inner of the tin with exhaust paste, this then slides perfectly over the jagged end of the exhaust, drills thro the three holes into the pipe, then screws tin to pipe. I started the bike, sounded like normal, all good. It was still on, with the writing clearly visible, when I took the bike for its MOT 6 months later, and it passed. The tester told me he'd only passed it mainly because of the hilarity it had caused at the testing centre, altho it was apparently techically legal.
(redexile, Sat 12 Mar 2011, 12:52, 1 reply)

I had an old BSA Bantam
For a few months, there was a large hole in the muffler. Neighbours complained, so I used two big hose clamps and a soft drink can to patch the hole.

Things do go quieter with Coke
(Redemption blamed it on the Bossa Nova since, Sun 13 Mar 2011, 23:11, closed)