It's not "games," really. Just goofs. Goofs and gags. We would slap each other in the face for the most innocuous shit. Not like a legit SLAP, but like a joke "how dare you" slap.
Also, one of our favorite things to do was when someone talked themselves into a corner during a debate. You know in movies or TV when someone puts a finger over the other person's lips and says "Sshhhhh..." Well, we would do that, but instead of a finger to the lips, we would awkwardly run our hands down their face, from forehead to chin. Because it's such a weird thing to do and it's hilarious.