Trope: The person who helped you out turns out to have ulterior motives behind it.
- Visit the trope's unabridged version HERE.
Film: A car valet learns one of his patrons is a Serial Killer.
- Visit the film's unabridged version HERE.
http://tvtropes.org/pmwiki/pmwiki.php/Laconic/BadSamaritan
FollowingLaconic / Bad Samaritan
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