We had a huge gift card for Outback. It's a $250 gift card. Anyway, we took all of the family to dinner, 10 of us. The bill was $170 or so. The kids left tips on the table to total about 22% of the bill. When we went to use the card the next time, a week later, 20% additional was taken out of balance. The server apparently decided 22% of the total bill left in cash was not enough, so he took 20% on top of that. I am pretty negative on gift cards after that experience.
We were able to see a history of the gift card, and it was taken out that evening of our family dinner. Told the manager about it, he said he would call us back. No call. Went in again, new manager now, he said, "This server has been here a long time, I don't see him doing such a thing."