(B)luetooth

So you can't use a cell phone while i my library (which always struck me as relatively obviously but maybe that's only me...)

Well it seems to me that whenever you have a rule, people try to get around it- which provides me with interesting stories:

Patron is on phone and I walk up and say, "You need to take the call in the hall."  I turn to walk away and realize she is not getting up.  I turn back and say in a louder voice, "Please take the call in the hall."  This time I don't move and after a second say, "Excuse me..." and she finally turns and says, "I heard you the first time."  So we've verified your ears work...how about your brain?

Patron is on the phone and I walk up and say, "You need to take the call in the hall."  He gets up and walks into the hall and about a minute later, returns...still on the phone.  "Um...when I said take the call into the hall I meant please finish the call in the hall."

And my favorite cell phone encounter (and the reason for this title): Patron is on the phone and I say, "You need to take the call in the hall."  He looks at me and responds, "But I'm on Bluetooth!"