Unjust Vexation from the word "unjust" means not just; lacking in justice or fairness, and the word "vexation" is defined as the act of harassing or causing trouble. So unjust vexation must mean harassing or causing trouble without justifiable reasons.
According to Atty. Sarmiento ( 10th Placer, 1997 Bar Exam.) that it will not burn too much brain cells to realize that Article 287, paragraph 2 of the Revised Penal Code that punishes “unjust vexation” suffers from congenital defects and should be declared unconstitutional for the following reasons:
Article 287, paragraph 2 of the Revised Penal Code condemns no specific or definite act or omission thus failing to define any crime or felony; Said penal provision is so indefinite, vague and overbroad as not to enable it to be known what act is forbidden; Such vagueness and overbreadth result to violation of the due process clause and the right to be informed of the nature of the offense charged; and Such vagueness and overbreadth likewise amount to an invalid delegation by Congress of its legislative power to the courts to determine what acts should be held criminal and punishable.
Professors of Criminal Law justify this apparent lack of definition saying that unjust vexation is a catch-all crime that applies whenever the act or omission complained of does not specifically fall under any other provision of the Revised Penal Code. But we do not even allow common-law crimes. In common law legal systems, the law is created and/or refined by judges: a decision in the case currently pending depends on decisions in previous cases and affects the law to be applied in future cases. When there is no authoritative statement of the law, common law judges have the authority and duty to "make" law by creating precedent. The body of precedent is called "common law" and it binds future decisions.
An examination of the annals of our jurisprudence would show that Art. 287, par. 2 of the Revised Penal Code has been used to punish a great variety of different acts:
In People v. Reyes, 60 Phil. 369, August 23, 1934, Art. 287, par. 2 of the Revised Penal Code was used to punish the defendants for unjust vexation for the act of disturbing or interrupting a ceremony of a religious character;
In Lino v. Fugoso, 77 Phil. 983, January 30, 1947, it was used to prosecute the accused of unjust vexation committed by stopping the jeep driven by the complainant in a threatening attitude and without any just cause therefor and telling him to stop driving for the City of Manila while the strike of city laborers was still going on;
In People v. Reyes, 98 Phil. 646, March 23, 1956, it was held that the act of seizing, taking and holding possession of passenger jeep belonging to complainant, without the knowledge and consent of the latter, for the purpose of answering for the debt of the said owner, constitutes unjust vexation;
In People v. Yanga, 100 Phil. 385, November 28, 1956, accused was convicted of unjust vexation for the act of compelling the complainant to do something against his will, by holding the latter around the neck and dragging him from the latter's residence to the police outpost;
In People v. Abuy, G.R. No. L-17616, May 30, 1962, the accused was prosecuted for unjust vexation for the act of embracing and taking hold of the wrist of the complainant;
In People v. Carreon, G.R. No. L-17920, May 30, 1962, accused was convicted of unjust vexation for the act of threatening the complainant by holding and pushing his shoulder and uttering to the latter in a threatening tone the following words: “What inspection did you make to my sister in the mountain when you are not connected with the Bureau of Education?”;
In People v. Gilo, G.R. No. L-18202, April 30, 1964, the Court held that the absence of an allegation of "lewd design" in a complaint for acts of lasciviousness converts the act into unjust vexation;
In Andal v. People of the Philippines, G.R. No. L-29814, March 28, 1969, accused were found guilty of unjust vexation under an information charging them with the offense of offending religious feelings, by the performance of acts notoriously offensive to the feelings of the faithful;
In People v. Maravilla, G.R. No. L-47646, September 19, 1988, a accused was convicted of unjust vexation for the act of grabbing the left breast of the complainant against her will;
Kwan v. Court of Appeals, G.R. No. 113006, November 23, 2000, the act of abruptly cutting off the electric, water pipe and telephone lines of a business establishment causing interruption of its business operations during peak hours was held as unjust vexation.
Art. 287, par. 2 of the Revised Penal Code that punishes “unjust vexations” is unconstitutional on its face for its fatal failure to forbid a specific or definite act or conduct. It suffers from congenital vagueness and overbreadth which are anathema to constitutional due process and the right of the accused to be informed of the nature of the offense charged. Therefore, Art. 287, par. 2 cannot be a basis of any criminal prosecution, much less conviction. An unspeakable injustice was therefore done to all those who were convicted under this unjustly vexatious law. (Atty. Sarmiento)