Put this clip right before the moment of impact, then follow it immediately with a Vine Boom Sound Effect for the crash and a Metal Pipe Clang Sound Effect if something heavy falls. For a slower build, place a Dramatic Dun Dun Dun Sound Effect earlier in the scene, then let this warning close the gap before the chaos.
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This is a short shout from Heavy in Team Fortress 2, yelling 'Incoming!' in a deep, loud, urgent voice for about two and a half seconds. It gives a jolt of alarm and comic tension, making a listener brace for a crash, a blunder or an ambush a beat later. The line warns teammates of danger in the game, and later became a cue in SMG4 edits and gaming memes.