The look on the kid's (he was 23 if he was a day) face was priceless: what do I do now?
That is I believe, what they call a 'field training opportunity'

Old sarge rolls up, gets out of car coffee in hand.
"What's going on rookie?"
"Traffic dispute,sir"
Sarge rolls eyes. Loudly into radio "I need ONE tow truck to this location"
rookie - "why only one?"
rookie and both ladies now looking at him.
"I only need to tow the car of the person you arrest"
Ladies - "Which one of us are you arresting?!"
Sarge with a grin "Whichever one of you is dumb enough to still be standing here when I finish this coffee."