Inducing phase separation by a sustained change of temperature often induces repeated waves of nucleation. As demonstrated in an accompanying movie, these oscillations can easily be demonstrated in the classroom by slowly cooling raw spirit (i.e., ethanol) and vegetable oil. In the present communication we suggest a minimal theoretical model predicting that they are of thermodynamic origin. Their frequency depends on the diffusion constant and ramp rate, and is not affected by the overall composition and sample geometry. Our experimental data support this model.