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Generally in thriller-type movies, there is a scene where A & B are talking.

But the scene ends with C listening secretly with an intensifying thriller sound.

Is there any single name for this common effect?

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Such a cinematic musical phrase is called a "sting":

A musical sting can be used in drama, comedy, horror or any genre, and in radio and television advertising. It is a part of the music director's lexicon. It is often used to build tension. Stings are often used in horror movies to accentuate jump scares.

Not to be confused with a "stab" but sometimes referred to as a "scare chord":

A cousin to the Sting, the Scare Chord is a sudden, sharp sforzando of dissonance or sheer noise intended to make viewers jump clean out of their seats. The thing that separates it from a Cat Scare is that it's non-diegetic: nothing onscreen causes the noise; instead, it's added to the soundtrack as a way of eliciting a jolt in the audience, often preceded by a deliberate lull in both narrative and musical action.

  • Thank You for bumping my question to regain the attention. – user47412 Mar 30 '17 at 8:44
  • @user47412 Welcome to movies.SE! If you click on the "edited Feb 27 at 20:12" link above the user iMerchant (not the "edit" link) you can see the "history" of the post. Your question was tweeted on March 3 and just about an hour ago the "Community user" bumped it up. I think in all Stack Exchange communities the "Community user" is a mostly automated algorithm (y'know, to keep things fresh!) – Mr. Kennedy Mar 30 '17 at 9:06
  • @user47412 just so you know, you can rollback edits or make further edits to your question even if other users make changes. One thought about the title, to get more eyes on the question and a quicker response, I would suggest maybe putting the "Intensifying thriller sound" part in the title, e.g. a title something like "what do you call an intensifying thriller sound effect?" might have gotten a quicker response with what you were looking for. – Mr. Kennedy Mar 30 '17 at 9:11
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I'm not sure of a film term, but musically, it's building tension by not resolving a chord progression.

Generally music is in a particular key. A key is denoted by its tonic note. So for example, C Major has its tonic note as C. You can think of the tonic as the stable base of the key. Composers form chords by combining different notes in the scale of a given key. These chords typically produce certain common psychological responses in people. And one of those responses is tension.

There are certain chords that feel like they want to move back to the tonic. In C Major, that would be a G 7th chord or a B diminished chord. They have notes (particularly the B) that make it feel like they're moving to, but haven't quite reached the tonic. And if you follow them by a tonic chord, it feels resolved.

So composers use this to produce or enhance a feeling in the soundtrack. When a character is running around trying to get away from the killer, that's pretty tense! So composers will often compose music with lots of unresolved chords to further that feeling of tension.

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    This is all true, but I suspect this is not actually an answer to the question. I think that the OP is not asking for how the music is composed, but rather what the particular trope regarding a secret reveal, a la Dramatic Chipmunk ( youtube.com/watch?v=a1Y73sPHKxw ) – Yorik Feb 28 '17 at 18:09

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