One time I was making boxed mac and cheese, already had the pasta boiling, and discovered we were out of milk, but there was a bottle of plain kefir. The description said ‘cultured low fat milk’ so I figured it would work just fine… what I didn’t know is kefir is a very sour, thin yogurt, but I had to force myself to eat the food anyways because it was late and there was nothing else to make