This theory goes a long way to explain vampire movies, which are both; and Meryl Streep movies about inspirational music teachers, which are neither.
Meryl Streep has not been featured in movies. 
mnli hypothesis: Meryl Streep has not been featured in movies.  premise: This theory goes a long way to explain vampire movies, which are both; and Meryl Streep movies about inspirational music teachers, which are neither.