Talk loudly, be insulting, make them not use ear protectors, use complex hard kicking guns, and laugh at their groups.
Do just the opposite of the above and you will have a good outing with them.
In reality, just get some nice .22 pistols and rifles and let them have some fun (but follow the 4 safety rules!!)
And then buy them some soft drinks after the shooting session.
"The government has confiscated all of our rights and is selling them back to us in the form of permits."