In 1982, Henenlotter gave us the cult classic known as Basket Case. If you've seen that movie, this review ends here. If you liked Basket Case, you'll like Brain Damage. It features the same premise of a boy and his monster sort of buddy on a romp through the streets of New York whilst the monster kills and the boy struggles with his morality. Well, I guess "addiction" is a better word in the case of Brain Damage.
There is another major difference between the two, and it's one that makes this movie as fun as it is. The monster, a turd-shaped alien symbiote named "Alymer" steals this movie and is one of the most entertaining horror monsters ever concieved. He talks like a gentleman and is so affable about his brain eating habits that you can't help but love him. In my personal favourite scene, he casually breaks out into song to torment our main character as he fights with his newfound addiction. It's the type of camp that only the 80s can deliver so well. You mix that with some good gore, a fun soundtrack and a certain Basket Case character cameo and I can't recommend Brain Damage enough.