I once flew an early Sunday morning flight from PHL-PIT on USAirways and was the only person in first on a 757 (when they had the 24 seats up front, not the 8 they have now). It was pretty awesome, but unfortunately it was only a 40 minute flight. The flight attendant up front literally told me to just help myself to the snack basket which she put on the tray table in the seat next to me.

I'm curious what route you're on that's so empty... Enjoy it!