well one way is you could taste something and it is sour but not supposed to be. If that happens, immediatly throw it out!
another way is if you are about to open a specific food (not soda or...
They don't "mean" anything, other than the replacement of the normal words that appeared in the original line. Are you thinking of this... "Come to the dark side" it's star wars language, look it up....
Both are technically correct. There are subtle differences between the tenses, depending on what you want to say. The phrase "has gone" is in the Present Perfect tense, and "had gone" is in the Past...