Um...the fridge funk. Everyone gets it, no one wants it, and that box of baking soda your grandma (and I) told you to keep in there doesn't always kill it entirely.
As a fresh alternative, Paulina sent in this idea to TipNut: simply cut the fruit out of an orange (lemon, lime, tangelo, what have you) and fill the rind with salt. "The salt absorbs stale and nasty odors while the [orange peel' releases a fresh, orange smell."
I'ma going to try to it tomorrow with my morning grapefruit. Smellicious.