Ah, the eternal struggle. Going over to your friends' house as a kid, getting ready to play video games and then having a big fight over what to play. On one hand, the there's the ol' "I'm the guest!" defense, which never seemed to work when vying for the only good controller. There's pretty stiff competition from the "My house, my rules" crowd, proponents of whom are known to jump to "I'm the guest!" when visiting other friends.
No matter which side you fell on as a kid, everything changes as an adult.