The aim of the current work is to study the role of the Aha!-experience in remembering the source of solutions, either self-generated or externally presented. In memory studies there are specific source-monitoring errors, which occur whenever a participant claims to have generated an idea that was derived from different sources (unconscious plagiarism). Several previous studies have shown that experiencing the feeling of Aha! during either problem-solving or the presentation of the correct solutions can have a beneficial relationship to the subsequent recall of the material with the processing of which it was associated. However, studies of the Aha!-experience on the source monitoring task (self-generated solutions vs presented solutions) have not been conducted. In the authors’ study, the hypothesis that the feeling of Aha!, associated with the task being solved, can affect source-monitoring accuracy. During the first stage of the experiment, participants (80 people) had to solve Compound Remote Associates Task items and to estimate whether they had a feeling of Aha!, when either generating the solution or being presented with it in case they failed to generate it. At the second stage, conducted a week later, participants had to recall if the solution was generated by themselves or just presented. The results confirm the generation effect, which manifests itself in successfully recalling problems for which a solution was found (sufficient generation) compared to problems with no-solutions found (fail-to-generate). Participants quite accurately recognized the source of the solution a week later, attributing generated solutions to themselves, while attributing fail-to-generate solutions to the presented ones. However, the authors did not find any additional impact of the Aha!-experience on the problem’s recognition, nor on the sourcemonitoring task performance. In the conclusion of the article, the contradictions of different experimental data concerning the influence of the Aha!-experience on long-term memory and further areas of research is discussed.