* A puctured tube - took it home patched it and still use it today.
* A Kids bike - passed it for 2 weeks and when it started to be stripped I took it home and fixed it up for my nephew. Only cost $10 to get running and clean.
* My wifes stolen bike. The bike was still using the same lock with the same combination as well. Stupid theives. Rode home, came back and stole it back. Sadly it had rusted somewhat.
* A complete low end full suspension mtb. I saw it 6 days running lying on its side in the park at 4am. No one picked it up. Sadly I was always riding my $2000 "fun" bike and didn't want to lock it up there to be stolen. It was almost brand new as well. It disappeared a few days later. Not that taking it home would have been all that useful. I don't need anymore boat anchors.
* A spiderman wallet - way out in the middle of nonwhere as well. It was clean so I took it home for my kid.

Some useful lengths of rope.