My Sibling's Secret Game Night...

So I found out my little sister has this secret game night with her friends where they play these really fun and sometimes weird games... She told me she was just studying but there were snacks everywhere and everyone looked like they had a lot of energy... I think one time they even dressed up in funny costumes for some silly party game... It's kind of embarrassing because here I am pretending to be all grown-up when secretly my sister is having way more fun than me... Now every time she asks to borrow the house keys, I wonder what shenanigans are going on behind closed doors...