I made fried rice a few days ago. It was good. I had leftovers the next day and it was better. I had leftover again a day after and it was even better (spices and flavours developed and it became more savoury). Presumably this will continue until it spoils, hence the title.
Confession. I thought of this while in the bath, not the shower.
You're absolutely right. It just doesn't apply so much to foods that are naturally antimicrobial, i.e. foods super salty and/or acidic (or super basic in theory, but I can't think of any examples).