Anchors Away!
My lovely wife and I bought a small canoe for our fishing escapades. It's a lot of fun but if there is any wind it difficult to stay in one place. We needed an anchor...
I took an old leaf spring and cut it using a cutting torch. I used a thicker center piece of the spring for the bottom portion of the anchor and then welded an end piece of the spring to the thicker piece and tied a rope through the bolt hole of the end piece.
It works great. In fact, I'm pretty sure this anchor would hold a boat that is a lot bigger than the canoe we have.