You're a little sceptical

“Sure right, I just stumbled over a wish-granting turtle while hiking in the desert,” you snort disbelievingly “I’ve just been out in the sun too long.“

“I assure you my offer is quite genuine” it responds stiffly clearly offended by your scepticism “Perhaps I was too hasty to offer you such a generous gift. Make your first wish now or I will curse you instead”

You roll your eyes deciding to humour it.