Have a carton of eggs with an expiration date that’s already passed? Wait! Don’t toss them just yet. Even though the use-by date on the side of the egg carton says they’ve expired, sometimes eggs stay fresh past that date. Do you know the tried-and-true method to test if an egg is good to use? The solution is as simple as placing the egg in a glass of water. Place the egg in a bowl of water. If the egg lays on its side at the bottom, it is still quite fresh.