In a kindergarten classroom, exclamations like "Oh no!" may be causes for concern. However, when the students in Mrs. Grabia's classroom shouted "Oh no!" and "Uh oh!" during an engineering-infused 5E lesson, it meant that a persistent little robot had pushed its way out of the fences they had created. It also meant that students had an opportunity to learn by discussing the problem, recreating their fence, and gaining a deeper understanding of big ideas in kindergarten physics. In this article, the authors describe this engineering-infused lesson for kindergarten learners that follows a 5E format (Bybee 1997). The 70-minute lesson, which was aligned with the science and engineering practices, crosscutting concepts, and disciplinary core ideas within the "Next Generation Science Standards" (NGSS Lead States 2013), consisted of a read-aloud engagement, a student-centered physics investigation, an engineering design extension (Lottero-Perdue et al. 2015), and multiple evaluation measures. Prior to this lesson, students had learned how different strengths of pushes affect the motion of objects; for example, a stronger push on a hockey puck made it slide further. They also observed how the direction of an object can change when it collides with something else.