My elder brother used to build bicycles out of bits he pulled out of a river. Like, literally.

He once built a bicycle that was so awful that it lasted him a complete undergraduate session at university, then a complete postgraduate session at a different university, and then I got it and it lasted me a complete (four-year) undergraduate session at a third university, and didn't get stolen once.

I only managed to get rid of it by leaving it, unlocked, in the hall of residence bike sheds, over the summer vacation. Even then it was possible the bin men just threw it away. But I like to think that it got thrown back into a river, and is waiting to rise again in future generations and make some other poor student's life a misery...