Question: Which of the actors that have played the character Lex Luthor have also been producers?
Answer(s):
answer: Anthony LaPaglia
answer: Gene Hackman
answer: Clancy Brown
answer: Kevin Spacey
answer: Chris Noth

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.04q78)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.04q78 ns:film.film_character.portrayed_in_films ?y .
?y ns:film.performance.actor ?x .
?x ns:people.person.profession ns:m.01d_h8 . 
}