Think your weird texting habits are harmless? Think again: your autocorrect mistakes might be building a criminal profile as we speak.

This video dives into the world of forensic linguistics, where investigators analyze word choices, spelling quirks, and writing style to figure out who wrote what, and sometimes even where they’re from. From tracking down the Unabomber to exposing J. K. Rowling’s secret pen name, it’s basically CSI: Grammar Edition.

Turns out, those little things you don’t think about can become actual evidence. Check it out!

[Via Neatorama]