If it's Friday, you're with your friends and you just finished your classes or your exams and don't want to go home and sleep, but rather celebrate the weekend, I recommend this great place in Madrid: TragaTapas. For 3 euros you can get a bucket of 5 small San Miguel beers and spend the afternoon there or just start the evening, it's up to you. And of course, you can go there any other day of the week. The staff is really nice and they have a large selection of tapas and raciones (the larger dishes). We tried the chicken wings, sushi and the spicy potatoes, but there's much more! Go give it a look!