In Spain the custom is that you have to eat 12 grapes, one for each stroke of midnight. You have to have swallowed them all by the last 'bell'. It supposedly brings good luck. I don't like it because everyone sits hunched over their grapes and it ruins the moment. Some people prepare their grapes in advance peeling and pipping them. You can even buy tins with exactly 12 peeled and pipped grapes from the supermarkets now.