Here's my joke. It's not funny, but I tried. And in keeping with the theme started by cassiesmom I'll go with a hospital related one:

The famous Olympic skier Picabo Street (pronounced Peek-A-Boo) is not
just an athlete. She is now a nurse currently working at the Intensive
Care Unit of a large metropolitan hospital. She is not permitted to
answer the hospital telephones. It caused too much confusion when she
would answer the phone and say,

Picabo, ICU