Place it immediately after the letter is shown, as the punchline to that moment, then follow it with a short reaction sound once the joke has landed. Keep it near the start of the edit so the letter stays the focus and the reply does not get buried later.
Sobre este som
This clip is a brief spoken Russian phrase, lasting under two seconds, delivered as a single short vocal line. It feels cheeky and light, like a playful nudge to stop being serious and mess around with a letter instead. The quick, teasing tone makes it land as a joke rather than a statement, giving a chat or edit a sudden, mischievous lift.