The lesson from the NASA Explorer Schools module Lunar Nautics: Lunar Base Supply Egg Drop makes a great family night activity. Students and their parents design and construct a package for the raw egg payload. The package should allow the raw egg payload to be recovered unharmed (both the shell and yolk should be intact) when dropped from a second story (height of at least 9.144 meters).
Ask the local fire department to bring a ladder and drop the eggs from the ladder.
Link to the NES Virtual Campus home page.