Strapped

There was a man walking along under the strain of a quite large rock he had strapped to his back. "But where is he going with it?" "He isn't going anywhere with it. He's just going. Though if you asked him where does he think he's going with it, he might tell you he's going somewhere great with his rock, even if he says it grimly, maybe even with anger. Then again he mightn't even be aware of the rock, might look at you like you're a madman, and on he goes."