Nirvan directed the Stop Motion for the title sequence to Willard (2003), a remake of a film about Rats starring Crispen Glover. The sequence incorporated elements from Crispin Glover's book Rat Catching, as well as a zombie rat skeleton. Check out this Interview Nirvan did with The Art-of-The-Title-Sequence blog.
"The film begins with a stop motion animated opening title sequence that … sigh… bliss. When a rat skeleton began to come to life, I nearly started doing a drooling giggle. I love stop motion dearly, and watching that skeletal, that dirty musky skeletal rat move a bit… well it just reminded me of those 1920’s Russian Animated masterpieces I have on tape somewhere here at the house." - Harry Knowles, Ain't It Cool News