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In this comedy, Yon (Jorge de Juan) is one of four college students, friends, who are not above using extraordinary means to pass their exams. For instance, not long ago one of them pretended to have a head wound so that he could conceal a radio transmitter in the bandages and give his pals a detailed preview of the exam he was taking. So it's only natural that such hardworking boys would be upset when one of their number learns that he has flunked his final exams. Yon's response was to write a very strongly worded anonymous letter of protest to his professor and post it in a bright yellow mailbox. Afterwards, he realizes with panic that he has inadvertently included the letter from the school informing him of his results in the exam, giving his identity away. Enlisting the help of his friends, they steal the offending mailbox in order to recover the letter. Unfortunately, their girlfriends aren't in on the game, and don't understand what they're up to, posing several delicious obstacles to a quick resolution of Yon's difficulties. It also doesn't help that a drug dealer has been using that same mailbox for drop shipments, and has been keeping an eye on it. When he sees the boys steal it, he doesn't immediately assume that anything good is happening.