I actually had my credit card send me a message because I tipped too much! It was a nicely laid out e-mail that had a column of numbers. And the percentage I added was in bright red. "You paid $12.64 for your meal and tipped $5. Are you sure you wanted to give this much?" YES! Because the waitress was working her ass of during the lunch rush! What's next? "Are you sure you wanted to buy name-brand toilet paper in bulk?"