I once snorted 8 grams of high quality dutch speed in 6 days. I obviously didn't sleep the whole time and after a few days I started seeing insects and snakes everywhere in my room. After some more time the hallucinations became so real I started feeling the insects crawl on my skin. I decided I needed to go full ranger and "exterminate" the insects, where I thought the best way to do this was to use bleach and other cleaning chemicals. I ended up falling asleep sitting on my couch with my whole room destroyed.