If you take a boy to a Renaissance Faire, chance are ...

he'll want a wooden weapon.

If you buy him a wooden weapon, he'll walk through the crowd fighting pretend enemies with no thought for the real people he's almost whacking.

If you take his weapon away, he won't understand. Not even when you promise to give it back when you get back to the campsite.

When you get back to the campsite and give the weapon back, he'll immediately commence "fighting" with his brothers in slow motion.

You'll have to tell him to get away from the van. 

Repeatedly.

He'll smash his brother's fingers or poke him in the eye or whack him in the head.

Repeatedly.

You'll take the weapons away and tell him to play something else for a while. 

He won't know what to play.

You'll suggest he play pioneers in the woods. And chances are, if he agrees ...

he'll need a wooden axe to chop trees down.