Connect
You've got a car, a weapon, and some thread lying around. So of course you decide to connect them all together.
Imagine using the thread to fasten the weapon onto your car, creating some kind of monstrosity. Surely this can't be legal?!
けい
つな
None
There's only one reason you've connected all this together: Tuna (つな) fishing. Obviously!
Your weapon of choice is a harpoon, which is perfect for catching big tuna. We'll just have to hope your car is amphibious, or we might run into some issues. Now let's go catch some tuna!