I wish Friday was a day of no-work... People seem to batch up all their requests from the whole week that they didn't report and drop them in your lap like a turd in the punch-bowl on Friday mornings. "Yeah, so we'll be getting a follow-up on Monday? Thanks, have a good weekend."
That's what I'd love to aim for, if I didn't have to be so responsive to enterprise customers...
On the rare occasions that there isn't a teacup-hurricane blowing, doing work on a Friday is possible. Still pretty rare, just because usually all gumption has been consumed by the time I stagger into Fridays.