Jack Brooks: Monster Slayer(2007)

...I used to be a plumber

As a child Jack Brooks witnessed the brutal murder of his family. Now a young man he struggles with a pestering girlfriend, therapy sessions that resolve nothing, and night classes that barely hold his interest. After unleashing an ancient curse, Jack's Professor undergoes a transformation into something not-quite- human, and Jack is forced to confront some old demons... along with a few new ones.