Place it at the very start of a skit or chat screenshot, before the favour is revealed, then cut to the other person's reply. Follow a refusal with Sad Violin to underline the rejection, or follow an amazed reaction with Oh My God Wow to sell the size of the ask.
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This is a short spoken clip of someone greeting a friend and asking, 'can you help me with something?' in a warm, hopeful tone. It lasts about two and a half seconds, with the friendly greeting giving way to a slightly sheepish request. It feels polite, earnest and a little awkward, like asking for a favour you know is a bit much.