My buddy Jason and I did this when we were little kids...
We went to the local Diamonds supermarkets, and used the payphone (which is about 6 feet from the customer service desk).
We called customer service:
Customer Service: "Diamonds, this is Beth"
Me: "Yes, ma'am, my uncle left the house without his wallet, and he's shopping there right now. Could you page him please and tell him?"
Customer Service:"Sure honey, what's his name"
Me: "Jack"
Customer Service:"Okay, just give me a minute"
(she puts me on hold)
Over the load speaker, we hear, "Jack, Jack, please come to the customer service desk, Jack"
She does the same thing one more time.
Customer Service:"Okay, he's not coming, are you sure he's at this store?"
Me: "Yes ma'am, but Jack's a pretty common name, so maybe you should call him by his last name?"
Customer Service:"That's a good idea honey, what's his last name?"
Me: "Mr. Mehoff, ma'am"
Customer Service: "Okay then, let me try again, hold on"
(she puts me on hold again)
Over the load speaker we hear, "Mr. Mehoff please come to the customer service desk, Jack Mehoff please come... SHIT"
(she picks back up the receiver)
Customer Service:"You little shit!"
We start laughing hard, and she looks over and sees us standing over near to her.
We hang up the handset and run.
Long story short, I was permanently banned from entering that store ever again.