Alright.
Student: A teacher!
Everyone knows that the person who gave you the gift is Santa.
Because she hasn't got arms!
Names.
A pair of legs.
Bob
Because if they get lost it takes ages before anyone notices that they're missing.
Professor: When I reached up to close it after the rain had stopped.
Because as they got on the boat to leave Italy, they were stamped on the head, "TO NY".
Because he left the Windows open.
You play it by ear.
The left ear, the right ear and the Final Front-ear.
Between us, something smells!
It's his private eye.