Lab ventriliquism

To teach teamwork use in a lab, I have students do different jobs.  I randomly assign the groups and the students decide their jobs.  So the instructions for the first lab on the board read
"Go to your lab stations"
"Decide jobs"

"perform lab"

etc

The jobs are coordinator
                    Quartermaster responsible for getting supplies
                    Operator actually does lab
                    Recorder 

"Mrs. W. we have a question."
"okay, Who's your coordinator?"
student who called pointed to other student
Me:  "okay, Chad what is your question?"
They realize I will only talk to the Coordinator.
First student to Chad, "ask her if this is the graduated cylinder we use?"
Chad, "is this the Graduated cylinder we use?"
Me: "have you asked your lab partners?"



*gotta love being obtuse but this is to train them how to be a team and not keep asking me for help*

One go round with a group had a student who was talking "You mean I was right?"