Put it near the end of a short edit, right after the moment a character claims the win, then follow it with a fail sting to undercut the boast. For a longer build, start with a moment of realisation before the announcement, and save the applause for a later, genuine victory.
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This 11-second clip captures Voldemort announcing that Harry Potter is dead, then breaking into a high, cackling laugh that makes the boast feel even more gleeful. It feels sinister and darkly funny at once, like a villain celebrating far too soon. The line comes from Harry Potter and the Deathly Hallows Part 2, released in 2011.