Isshu in episode 26 while under the love spell, when trying to impress Nanami after Yousuke and Kouta told Isshu to give Nanami a cute animal as a gift. The cute animal that Isshu gave her, a cow. It's hilarious.
What's more, the Hurricanger spent the rest of the episode trying to figure out the identity of Shurikenger... That scene above didn't even bat an eye on them, and when the reveal hit in, only then they realize. "Damn, I should've noticed that he spoke English!!"