My wife and I did part of our gift registry at ‘crate and barrel’, they had a business card pot to have a drawing from for some cookware, I had just gotten my first business cards, and remembered a tip I’d read about bending/creasing the business card in half before dropping it in. I tried it and we won a 4 quart ‘le cruset’ sauce pot. It’s the most expensive piece of cookware we have, and it’s amazing. I haven’t used that trick since then, partially out of guilt, partially out of being 1 for 1 on business card draws.