Question: By what was the subject of Gore Vidal's Lincoln killed by?
Answer(s):
answer: Firearm

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:film.film_subject.films ns:m.04j21rb . 
?c ns:user.alexander.misc.murdered_person.murder_method ?x .
}