The Nurse:

A very tired nurse walks into a bank, totally exhausted after an 18-hour shift. Preparing to write a check, she pulls a rectal thermometer out of her purse and tries to write with it. When she realizes her mistake, she looks at the flabbergasted cashier, and without missing a beat, she says: 




'Well, that's great....that's just great.....some asshole's got  my pen!'