...... wait... smarties... like the candy?? or is there some other, far more addicting or desperately helpful thing that I'm unaware of?
Well, remember what the OP mentioned - the customer complained he'd been struck in the noggin with a hunk of concrete, and also complained he couldn't see out of one eye; there was also the observation that he appeared a bit 'off'.
Blunt trauma to the brain bucket can definitely cause these things, as well as confusion and inhibition of rational thinking (aka loss of judgement).
Like prioritizing candy over medical care, for instance.
I hope the poor guy's all right. Head trauma can cause even more unpleasant things.