Here's how it works:

* Friction: When you rub the balloon against your hair or clothing, you create friction. This friction causes electrons (negatively charged particles) to transfer from the surface you rubbed to the balloon.

* Static Charge: The balloon now has a net negative charge.

* Attraction: The ceiling, usually having a neutral charge, is now attracted to the negatively charged balloon. This attraction, caused by the opposite charges, is what makes the balloon stick.

Important Note: This works best on dry days, as humidity can reduce the static charge buildup.