Yes it happens sometime with a combination of high temperature and humid air and body dehydratation. Well it happened to me at least once, but nothing near to hallucinate i'm shitting. No, it was more like I can't concentrate more then a few seconds on anything. It was like if I was too stone eventhough I smoked the same stuff/quantity since a week. Trying to behave normally in a crowd fucked up like that was not that easy.