Online explanation videos on platforms like YouTube are popular among students and serve as an important resource for both distance learning and regular science education. Despite their immense potential, some of the explainer videos for physics include problematic explanation approaches, possibly fostering misconceptions. However, some of them manage to achieve good ratings on YouTube. A possible reason could be that explainer videos with misconceptions foster an “illusion of understanding”—the mistaken belief that a topic has been understood. In particular, misconceptions close to everyday experiences might elicit greater interest and appear more convincing than scientifically correct explanations. This experimental study was conducted to research this effect. Physics learners (N = 149), with a low prior knowledge enrolled in introductory university courses on primary education, were randomly assigned to experimental and control groups. While the experimental group watched a video introducing the concept of force relying on misconceptions, the control group watched the scientifically correct video. Both videos were comparable in terms of comprehensibility and duration. In the posttest, the experimental group believed that the video was scientifically correct, well-explained, and that they do not require further instruction to understand the concept—indicators of an illusion of understanding. The video including misconceptions was perceived as better understandable than the scientifically correct video (d = 0.62*). The experimental group was significantly more convinced by the misconception after watching the video than the control group (d = 1.86**). They learnt more erroneous knowledge about the misconception than the control group about the scientifically correct concept (Cohen’s q = 0.37*). We argue that this might become problematic (a) in physics instruction because students who have watched a misleading video might regard further teaching in school as irrelevant, and (b) learners might tend to rate videos including misconceptions better on an online platform like YouTube.