For those of you instructors out there who have students who seem to fumble over the radio all the time or seem timid or even scared to hit that push-to-talk button...this is a great technique for showing them that the guys barking orders up in that scary tower are just real people.
I found that scheduling times for my students to go up and meet the people looking down on everybody was a very useful lesson. Sometimes all it takes is just to find out that the controller is human, too!