TEETH, Leprechaun, and The Gingerdead Man (starring garry busey!) are what come to mind first...but theres a plethora of other weird/terrible/strange ones out there...
Tokyo Gore Police was insane!!
A friend loaned it to me and I started watching it on a long train ride. Decided to turn it off after a few minutes, wasn't really public viewing friendly...
Here's a movie that I just heard of, it was sent to me to be viewed at the indie grind film fest-
Thankskilling
It's about a homicidal turkey that goes on a rampage on a group of teenagers on a thanksgiving vacation.