Buttercup and Westley

From Cross

Back in June, Nami and Gojyo were hypnotized by Jango, and believed that they were Buttercup and Westley from The Princess Bride. Gojyo = Buttercup Nami= Westley

They almost ran off and got married, but Livio stopped them. They later never remembered a thing, but recently, Nami has started calling him Buttercup.