A proctologist is about to write a something on his patient's notes but when he goes to take his pen out of his pocket he realizes it's actually his thermometer that's there.
He says, "Darn, some a**hole has my pen."
An Absent Minded Doctor
A doctor is going about his business, with a rectal thermometer tucked behind his ear.
He goes into a staff meeting to discuss the days activities, when a co-worker asks why he has a thermometer behind his ear?
In a wild motion he grabs for the thermometer, looks at it and exclaims: "Darn, some as*hole has my pen!"