Place it as the final beat after the favour is shown, then follow it with Woody Woodpecker Laugh to keep the joke moving, or cut to You What when the other person looks confused by the thanks.
About this sound
This just-over-a-second clip has Andy Kaufman as Latka Gravas, the gentle foreign mechanic from Taxi, saying thank you very much in a slow, heavily accented, singsong voice, with each word spaced apart. It feels funny and slightly uneasy, because the gratitude sounds genuine yet oddly formal, as if the speaker is not quite sure how the phrase should land. Kaufman brought the character to Taxi, which began in 1978.