Videogrep is an open source command line tool that searches through dialog in video files (using .srt or .vtt subtitle tracks, or pocketsphinx transcriptions) and makes supercuts based on what it finds.

All instances of the word "time" in the movie "In Time"

Former White House press secretary Jay Carney's telling us what he can tell us

Grammatical patterns in 100 Ted talks

All silences in the movie Total Recall