I found these strange brown 5mm long oval 'things' in the house and couldn't figure out what they were. I even wondered if they might be some sort of elongated plastic beads from a bracelet, but I squashed one and it was creamy and squishy inside. Lovely. A little bit of research reveals that these are almost definitely fly pupae, perhaps of a common house fly or similar.

This web page has a great picture that shows the housefly fly in all its stages of growth. I must admit I'd never seen the pupae before.