At first, I thought one would be enough. Then I thought, But what if my lead breaks during a section or I run out or something? So then I thought two would be good. But then I thought, What if someone needs a pencil? I'm a nice guy, I'd probably give them one of mine. So then I though three would do. But then I thought, What if I lose one on the way?
...Long story short, my wheelbarrow didn't fit through the door, so I wrote the test in blood.