I once received a bottle of champagne on an ORD-HNL flight (maybe they felt sorry for me - I think I was the only one on the plane traveling on business!).At baggage claim, I noticed a young honeymooning couple that I recognized from the cabin, and offered them the bottle in celebration of their trip. They were thrilled. Later, I got in the check-in queue at the Hilton Hawaiin Village, only to see the same couple in front of me. Since it was rather a long line, they popped the cork, and shared it with all.

Other times, I've received a bottle after passing the FA one of those "attaboy" coupons, for exemplary service.