Tower received a call from a crew asking,

"What time is it please?"

Tower responded,

"Who is calling?"

The crew replied,

"What difference does it make?"

Tower replied

"It makes a lot of difference. If it is an American Airlines

flight, it is 3 o'clock. If it is an Air Force plane, it is 1500 hours. If it is

a Navy aircraft, it is 6 bells. If it is an Army aircraft, the big hand is on

the 12 and the little hand is on the 3. If it is a Marine Corps aircraft, it's

Thursday afternoon and 120 minutes to "Happy Hour".