This, of course, also includes lines from books, television shows, songs, and any other form of popular media.
When I was but a phoukling, my family played a game we referred to as Quotes. The idea was to quote a line from a movie, and the others had to figure out which movie it came from. While there was no formal tracking of scores, respect was given for finding a crucial line from a well-known movie that still managed to stump the others. Phoukabro, for instance, still gets kudos for his “whichever way it goes, we’ll need six coffins” from High Noon.
Yet, some lines were so practical that, once introduced through the game, they became part of the family dialect. They include:
"I grovel in mortification!" from Death on the Nile. I introduced that one when I was being chewed out for something and so amused the parents, I escaped further retribution. It is now accepted as an apology for nearly any situation.
"Put! Ze candle! BECK!" from Young Frankenstein. Phoukamom intro’d this while teaching a nursing lab and one inquisitive student wouldn’t stop touching thing. They stopped.
"That’ll be the day." by John Wayne in The Searchers. Introduced by phoukadad when I and the phoukabros promised to do chores or some other activity. We now use this on him just as often.
"It might be a tumor." from Kindergarten Cop. I actually got to do this with the original set-up by phoukabro when we were out for breakfast one morning. He was frowning and rubbing his forehead. I asked him what was wrong, and he replied, “Oh, I have a headache.” With a huge grin and a very creepy voice, I immediately said, “it might be a tumor.” There was a half-second where he stared at me, not exactly horrified, but definitely trying to figure out where the hell that had come from. Then he figured it out and said, “Id’s nod a toomah. Id’s NOD!”. This is now used to respond to any complaint from “my car won’t start” to “who ate all the cheese?”.
Please, add your own, because I know you’ve got them.