I was walking back to my halls and saw this guy in front of me with a can of XXXX in his hand screaming and I mean really screaming like he'd seen something terrifying I crossed the road to try and see what was scaring him so much to se if I could help but there was nothing there I've seen that happen a few times now with different people so my question is Can alcohol cause hallucinations? or is it possible he had another disorder like schizophrenia?