Suppose Sara planned a surprise party for her best friend's birthday. She invited all of their closest friends and family to celebrate at a rented venue. The decorations were colorful and festive, and the birthday cake was specially made with the friend's favorite flavors and colors. As the friend walked into the party, everyone jumped out and shouted 'Surprise!'
Can we infer that "The friend knew about the party beforehand."? Yes, no, or maybe?