Flirting help? (guys answers preferably)?

friday me and a couple of friends (including my crush) are hanging out. i think he might like me too but he doesn't know i like him. we are watching a few scary movies and i really want to be flirty without the rest of my friends making fun of me and stuff so please please PLEASE help with advice on how i can subtly but somewhat noticeable flirting. THANK YOU! I really appreciate it! (btw we are only 14)