XDDD I simply have no words to praise you in equivalent humor. LMFAO HOW THE HECK DO YOU DO THAT
I'm glad that someone was amused by my *ahem* "Kitchen jokes."
Where should one use Passive Voice though? What are the instances?
A lot of language is knowing it in your gut. This comes from reading a lot, listening, and writing. A strict adherence to a language's rules might get a text technically correct, but it will sound stilted. It is zen-like in that regard.
It certainly has a place in dialogue. Even if the writer agrees that the passive voice should be avoided, the characters in the text might not. It can be used, then, to the extent that the character might use it. Same with a narrator, although that can be a bit more tricky. The passive voice is a great place to hide because it has an air of authority to it. Compare "the meeting is at 11" with "the meeting will be held at 11." The former is informal, and as such something that you might want to double check. The latter, though, sounds formal and authoritative. That meeting WILL be at 11, come hell or high water! Thus, characters (and narrators) accustomed to lecturing or authority might use the passive voice often. Likewise with characters who are unsure of themselves: it's safer to make things sound authoritative, as it is less likely to be called into question.
It also can be used to add a bit of variety (I tend to find texts that are nothing but the active voice to be stale and repetitive). Since it is best as a spice rather than as bread, though, it can also be used to call attention to an important line in a text. This ties back into its air of finality: if used judiciously, it will call attention to itself when it is used. Since English trains us to look for the important thing at the beginning of a sentence, this also allows us to emphasize the thing acted upon more than the actor. And lastly, it can also be used as a link in a train of thought. Imagine a court scene. "No one questions that this gun shot Ms. Example. The bullet from that gun is what killed her. And this gun was shot by that man!" It creates a link between two different ideas, and thus eases the transition between the two.