CC Ādi 14.73
basiyāchena sukhe prabhu deva-viśvambhara
Although He is the maintainer of the entire universe, once the Lord sat upon some rejected pots in the pit where the remnants of food were thrown, after the pots had been used for cooking.
Formerly it was the custom of brāhmaṇas to worship Lord Viṣṇu daily at home and cook food in new pots. This system is still going on in Jagannātha Purī. The food would be cooked in earthen pots, all fresh and new, and after cooking, the pots would be thrown away. By the side of the house there was generally a big pit where such pots were thrown. Lord Caitanya Mahāprabhu sat down on the pots very pleasingly, just to give His mother a lesson.