haha, you can be anyone you want over the phone.
At my work, calls for the shop are usually paged over the loud speaker. One of my coworker's buddy always calls and gives fake names, and the lady at the front desk is none the wiser.
So one day I'm walking through the shop and hear on the loudspeaker,
"Ray park one, Ron Jeremy. Ray park one".
Needless the say the owner heard it also and wasn't happy.