Yeah, not even two decades after the first colours got invented in '91, Fabulous Inc. had cornered the market and bought all of them. On the press event where the CEO signed the deal for the last remaining colour, Turkish Blue, a tragic accident happened.

As he was fitting Turkish Blue into his suitcase, he formed the first-ever rainbow, which immediately started radiating violently, turning the whole event into a massive gay orgy.

Even more tragically, though, they had brought in colour cameras to capture the Turkish Blue, and so, everyone who was watching at home, got directly exposed to the rainbow colours, too.
Loving husbands, grandpas, child sons, they all got turned into gay people.

Only upside is that we also got lesbians out of this.