Question: What movie released before 02-17-2012 does Zac Efron star in?
Answer(s):
answer: Melinda's World
answer: High School Musical
answer: Me and Orson Welles
answer: High School Musical 2
answer: High School Musical 3: Senior Year
answer: Hairspray
answer: The Derby Stallion

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.06wm0z)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.06wm0z ns:film.actor.film ?y .
?y ns:film.performance.film ?x .
?x ns:film.film.release_date_s ?c .
?c ns:film.film_regional_release_date.release_date ?num .
FILTER (?num < "2009-02-17"^^xsd:dateTime) . 
}