"Yuuuck!" "Gross!" "Cool!" The response to slugs is never indifference. These slimy creatures are perfect for captivating students' imagination and curiosity, and they are ideal subjects to introduce investigative science. This article describes a classroom activity in which students design a research investigation to answer the question: "Is slug slime a good glue?" Through a series of guided steps, students work in small groups to decide how to measure the success of an adhesive. Each research team invents a unique tool, the "Sticky-O-Meter," to quantify glue stickiness. Students compare results for slug slime with those from a commercial adhesive. (Contains 1 table and 5 figures.)