Balloon Rockets - I've done this in several science camps I've conducted. Kids have fun with it. But, when the balloon deflates it may fall off the straw because it's surface area changes - another good thing to show and explain to kids.
Can do this for basement bowling, green, red & blue? Night Time Bowling water bottle recycle camping glow stick sleepover summer outside play games block party dollar store kid toddler. No instructions - Just a picture.