A DuPage County Judge has ordered a teenager to pay a $750 fine and perform 120 hours of community service work for an agency that works with AIDS patients after he was found guilty of contaminating salad dressing with his semen and returning it to his high school's cafeteria.

The Judge has also placed Marco Castro on two years probation Wednesday and ordered him to write a letter of apology to Wheaton North High School officials.

AP reports that Castro pleaded guilty to misdemeanor disorderly conduct in connection with the Dec. 6 incident. He confessed he took a bottle of ranch salad dressing from the school cafeteria to the bathroom and ejaculated into it.

After performing the disgusting act, Castor returned the semen-contaminated bottle to the cafeteria where most of the school students eat lunch. Thankfully, there are no cases of any kinds of illness following the incident.

"I have no explanation for what I did. I felt bad after I did it," Castro said in the Court adding that the idea of the prank came into him mind after watching some movie.