The two phrases in this clip both grew into internet memes before they were combined. Just Do It comes from actor Shia LaBeouf's intense motivational speech, filmed in 2015 as part of an art project and later remixed endlessly online. FBI open up became a separate running joke for surprise raids, dramatic entrances and exaggerated authority in short videos. Putting them together turns a warning into encouragement, which fits the fast, remix-heavy humour of TikTok and meme edits and keeps the short clip easy to reuse.