What are some cool body illustions?

Question

Like the one that makes you fill heavier.

Answer 1

Stand in a doorway and lower your hands to your sides. Keeping your arms straight, raise your hands until the backs of your palms touch the sides of the doorway. Press as hard as you can against the doorway for 30 seconds. Then relax your arms back to your sides. It will feel like your arms want to rise by themselves.