Place it at the end of a short skit as the payoff, after a shocked sound sets up the surprise, then follow it with an oh no no no laugh to keep the joke rolling. It also works as a bridge between two gags, letting a goofy yell open the next beat.
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This ten-second clip is a bright, wordless vocal performance, with a male singer carrying a bouncy melody using only lilting 'la-la' and 'trololo' sounds and no real words. It feels cheerful, playful and slightly absurd, like a confident musical shrug. It comes from Eduard Khil's 1976 performance of 'I Am Very Glad, as I'm Finally Returning Back Home', which became a worldwide internet meme.