Alcohol consumption has profound effects on behavior, such as impaired judgment, addiction or even death. It is estimated that alcohol contributes to around three million deaths worldwide, 13.5% of them in young people with ages between 20 and 39 years. Consequently, it is necessary to raise awareness among college and high school students of the risk related to alcohol drinking. The small nematode "Caenorhabditis elegans" is an animal widely used as a model organism to study nearly all aspects of Biochemistry. It is a powerful tool to test the potential bioactivity and molecular mechanisms of natural compounds and drugs "in vivo." Therefore, it is an interesting topic to include in an undergraduate course of Biotechnology, Biochemistry or Biology students among other scientific vocations. "C. elegans" is also used as a neurobiological model to evaluate substances' neurotoxicity and behavioral effects. The proposed experiment introduces students to the handling of this preclinical model and to the evaluation of behavioral alterations induced by chemicals in scientific research. The effects of different doses of ethanol on "C. elegans" behavior are studied using a versatile chemotaxis assay. This laboratory experiment is suitable for an undergraduate course. The practical session can be used in the global strategies of information and awareness of educational centres to mitigate the impact of alcohol abuse among students, both in formal courses or in Science fairs or exhibitions.