[CobraDan]

A police officer, though scheduled for all-night duty at the station, was relieved of duty early and arrived home four hours ahead of schedule, at 2 AM.
Not wanting to wake his wife, he undressed in the dark, crept into the bedroom and started to climb into bed. She sleepily sat up and said, "Mike, dearest, would you go down to the all-night drug store on the next block and get me some aspirin? I've got a splitting headache."
"Certainly, honey," he said, and feeling his way across the room, he got dressed and walked over to the drug store.
As he arrived, the pharmacist looked up in surprise, "Say," said the druggist, "aren't you Officer Fenwick of the 8th District?"
"Yes, I am," said the officer.
"Well, then, what in the world are you doing in the Fire Chief's uniform?"