Security studies Puns

So I was eating lunch with some friends when a security guard entered and walked up to our table. The following conversation ensued. [As accurate as I can remember] >Him: How's it going?

>Us: Uh... good?

>Him: That's nice, I noticed you guys were sort of making bird sounds, as a matter of a fact, I studied bird calls in college!

At this point he rambled on for a few minutes about how he could do any bird call we could name, so we asked him to do the robin.

> Him: Fiddles with hands for a few seconds like you would do a normal bird call, Then to our surprise shouts out "Here Robin!, Here Robin!"

Needless to say, he got us pretty well.