Maybe C's (my dad's girlfriend) sister called me today and invited me to the family gathering on Monday. Maybe neither C nor my dad have mentioned this at all. Maybe I'm not going to make my regular Sunday am call to Dad and C. Maybe I'm merely going to attend the gathering without letting them know. After all, her sister knows, and she's the one that invited me.
Maybe I'm supposed to come with a joke, but I don't know any jokes. Can anyone help? Siri certainly was of no help.

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A: Because it wasn't peeling well.