In reply to:

I didn't know the sign for 'duck alert, duck alert'!!

Having been a water ski instructor on Lake George, NY, I'm very familiar with this "sign." While the boat is bouncing over the waves, the spotter must perch on one leg, and frantically flap the elbows while quacking as loudly as possible. I have heard that this "sign" has been officially discontinued due to the loss of too many spotters. They tend to be thrown overboard when attempting it.

Jack

"People generally quarrel because they cannot argue." - G. K. Chesterton