Ultraman's Ultra Slash vs. The Mysterious Talking Grapefruit!

A woman buys two strange grapefruits, but no matter how hard she tries, they just won't cut with a fruit knife. The man then attempts to use the Ultra Slash and Ultraman Spark, but both fail miserably. Shockingly, the grapefruit starts talking, mocking humans as if it's some otherworldly being! In the end, the man dons his Ace Ultraman TAC team uniform and unleashes the Ultra Guillotine to finally slice the grapefruit open. What kind of fruit is this?!