Coke Zero. Because I'm old.Saturday as hang-out day makes sense to me, especially now that I work from home. Once I log off on Fridays I typically just want to go couch-potato mode for the rest of the day. Unless I have it planned days in advance, Fridays are to myself.
And also because Friday hasn't really been my go-to party night for like 20 years now (Saturday's more my "go out and do stuff/hang out with friends" night).