[kristiandupont]

A friend of mine told me about how they once had to dig through their code to figure out why their site was classified as adult by some filter. After days of searching, they found this comment at the bottom of a javascript file:

// Slut.

Which is Danish for "the end".

[renekooi]

Another false positive anecdote! My parents used to have their ISP's adult content filter enabled. One day I couldn't visit DeviantArt, because it said "Mature Content Filter Enabled" somewhere on the page, and "mature content" triggered the ISP's filter.