Start with the title: it is the hook
Your title opens the video. The first clip is the title card on its own, so write a line a viewer gets at once and needs resolved. Put the surprise, the stakes or the contradiction in the title itself instead of saving it for the body.
"My roommate numbers every egg in the fridge. This morning egg 7 was missing." works because nobody can scroll away without knowing who took it. That line tops your downloaded card and opens the video as clip 1, so a strong title does both jobs.