Rubber Egg (also called a Naked Egg)
Find out what happens when you soak a raw egg in vinegar for a few days. Ours broke open to reveal a yolk that felt like jelly. Ewwwww!!!!
This was a favorite. Hold a raw egg in your hand and squeeze from end to end as hard as you can. It won't break! Really, it won't!
Egg in a Bottle
This one involves a peeled, hard boiled egg being sucked into a bottle. How does it happen?!
Just by spinning an egg, you can tell if it's hard boiled or raw.
I found several more "eggcellent" experiments here if you want to try them too.