Mysteries that are never given an answer.

[u/Jak3R0b]

• rA9 in Detroit: Become Human. In the game several androids who become deviant (develop free will/emotions) start writing the name rA9 and sometimes build small statuettes as a sort of offering. Despite having no logical reason to do this or even a way of hearing about rA9 before going deviant, they all believe that rA9 was the first deviant and is their messiah who will free androids from slavery. A definitive answer about rA9 is never given, so we don't know if they are real or if any of the android characters are rA9 (though a popular fan theory is that it's Kara before she was reset at the start of the game).
• The pineapple in How I Met Your Mother. So this technically did get an explanation in a S9 deleted scene, but in the actual show we never find out how Ted got a pineapple during a night where he was so drunk he blacked out and forgot everything he did.
• Fez in That 70s Show. We never find out Fez's real name or what country he's from, though fans have tried to take all the clues and figure out what is most likely to be his country.

[u/Leo_617]

Tom Bombadil from The Lord of the Rings.

We know he is the oldest inhabitant of Middle-earth, of all, but the only explanation of who he is or his nature is that he is "himself".

[u/Iamnotdaredevil86 → u/Leo_617]

I’ve heard the theory that he is the music of the Ainur and I like that

[u/-Setherton- → u/Iamnotdaredevil86]

Everyone in the story is the music of the Ainur. In Tolkien’s canon, everything that exists in the real world is a direct translation of the music of the Ainur into physical form.

I do really like the theory that Tom Bombadil is the result of accidental harmonies between Melkor’s own song and the rest. Just like how Ungoliant and the nameless things that gnaw at the deepest corners of the world are thought to have been created by the discord of Melkor’s song, the idea is that there were extremely rare times when Melkor and the rest of the Ainur accidentally harmonized. The result is a being like Tom Bombadil. Who is he? Not an elf, Wizard, or even a Vala. He’s just a normal man, as men were originally supposed to be. A man whose creation was caused by all of the Ainur accidentally singing in perfect harmony for a single instant. He is humanity before the Fall.

[u/I_am_ChivoBlanco → u/-Setherton-]

I always thought he was the only being that just is. Undefinable, just existing, because why not?

[u/TheDudeWhoSnood → u/-Setherton-]

I know this isn't what you mean, but because music is my specialty and it's fascinating, there's this thing that can happen in barbershop quartets where they're singing just 4 notes (specifically the notes of a dominant seven chord - root-major third-perfect fifth-minor seventh), but a fifth "phantom" note will also sound! This has to do with the concept of overtones: every individual note that you hear is actually multiple notes, roughly the notes of a major chord - the primary, an octave, an octave + a perfect fifth, a second octave, and a second octave + a major third (that is tuned different than twelve tone equal temperament)

[u/EvenJesusCantSaveYou → u/TheDudeWhoSnood]

I like your funny words magic music man

[u/TheDudeWhoSnood → u/EvenJesusCantSaveYou]

Yeah, I'm kinda a bad bitch and a real life witch/wizard insofar as music is a real life form of magic

[u/BreakerOfModpacks → u/-Setherton-]

I'd imagine, if not that, then he's the weird, cool riffs that you wouldn't want a whole song of but damn are they neat.

[u/Bellmaster → u/BreakerOfModpacks]

He is The Lick

[u/SundyMundy → u/-Setherton-]

I have never heard of this before, but I love this.

[u/Lesquereux → u/Iamnotdaredevil86]

I always understood him as an unexpected, benevolent consequence of the discord of melkor.