I just remembered one that isn't technically a revival, but a how to tell if your eggs are still good long past the carton date (and they stay good for some time actually):
a measuring glass or bowl made of actual glass or clear plastic (you need to be able to see through it)
fill with water enough so when you place the egg into it, it can float without touching the bottom
gently place egg in water
If it lays on its side at the bottom: fresh
If it stays on the bottom, but with the top tipped up: still good, but not fresh
If it floats (no touching bottom at all): toss it out - it's gone off/bad
I've used eggs weeks past their sell by date safely using this technique. It has to do with the air pocket inbetween the shell and membrane inside the egg, and the fact that as the eggs age, the air pocket gets larger.