Joke
,Late one night the air traffic control tower got a mayday call. Help, I am flying at 18,000 ft, doing 200 mph, UPSIDE DOWM.
Tower answered and asked, "How do you know how high you are?" caller " by this gauge", Tower " How do you know how fast you are going?", caller "by this gauge," tower that's good but how do you know you are upside down? caller " Because the P from my pants is running down my neck."