I'm waiting for a bus and I'm thinking about nothing.
You can't actually think about nothing so what I'm thinking about is nothing in particular.
Thinking about nothing in particular means that I'm thinking about several things.
So I'm waiting for a bus and I'm thinking about several things.
But I'm not really thinking about several things, several things are going through my head but I'm not reflecting on them.
So I'm waiting for a bus and I'm not thinking about several things.
Not thinking about several things means that I'm not thinking.
And if I'm not thinking then I must be dead.
So why am I waiting for a bus if I'm dead?