Do something involving decay and bring smelly old socks.

(to YMCA)

BETA DECAY!

;)

It's not exactly using socks, but I used to put little water balloons inside a bigger water balloon and use an incident particle (sharp object) to burst the larger balloon...then the little balloons would move out freely (like in fission), the littlest balloons can be thought of as neutrons, and middle size ones as fission products...you can also have other objects to be beta particles, neutrinos, etc...

NSF Program Director (on assignment from the AIP and the Society of Physics Students to serve as the Robert Noyce Scholarship Program Director at the National Science Foundation)