The Night Nurse;
A very tired nurse walks into a bank, totally exhausted after a 16 hour shift.
Preparing to write a cheque, she pulls a rectal thermometer out of her purse and tries to write with it. When she realises her mistake, she looks at the flabbergasted teller, and without missing a beat, she says:
'Well, that's great....that's just great...some #$%*'s got my pen!'