Also, when you get home, don't immediately go running outside to play with your friend. If one of you gets the brilliant idea to make a giant mud puddle with the hose, be the older person and walk away.
And whatever you do ... don't plaster a mud pie directly on the front of your shirt. The stain won't fully come out and you'll ruin your school clothes.
Note: the kid in the picture is not me, but this is pretty much exactly what I looked like that fateful day.