Assemble the following simple items:
2 cups of water
Sprinkle the pepper into both cups of water so that it covers the surface of the water.
Stick your finger into the first cup of water and pull it back out. What happened?
Now put just a drop of liquid soap into the second cup of water. Then put your finger into that cup and pull it back out. What happened this time?
After doing this, check the comments section of this post for the application of this little activity.