IT capitalizes on those things that scare kids most: being alone, being trapped, getting lost, basements, haunted houses, the unknown, and, of course, monsters. The movie reminds you what it's like to be a kid again -- the good, the bad, the mortifying. It's a strong tale about supporting your friends and standing up to your fears. New fans might get Stranger Things vibes; others will have no problem seeing IT as the Stand by Me of King's cinematic horror canon.
For the members of The Losers' Club, as the kids are known, it takes a broken arm and a near-death experience to show the squad they're strongest as a unit. As Pennywise lures the Losers into the sewers for one last meal, the kids realize their strength in numbers and clobber the clown. Since It feeds on fear, the entity becomes outmatched. Defeated, ineffective, Pennywise descends deeper into the sewers, into a pit of darkness before Bill can deliver one final blow. The kids celebrate and cap their heroics with a blood oath: If It comes back in 27 years, so will they.