It's just an old superstition that it's bad luck.
It's not!
He liked to whistle as he walked.The whistle signalled the end of the match.
The Noon Whistle was created on 1923-04-29.
3 long blast to the ship whistle.
The question is why would you want to whistle while eating crackers? lol.
If you hear an emergency whistle while hiking in the wilderness, you should stop and listen carefully to determine the direction of the sound. Stay calm and try to locate where the sound is coming from. If you are able to, follow the sound to find the person in distress and offer assistance. If you are unable to locate the source of the whistle, stay where you are and blow your own whistle in response to signal that you are nearby and willing to help.
That must be a habit of his/her. To sing/whistle while walking
The signal for a fire on boards is a long blast on the ship's whistle along with sounding of the vessel's general alarm.
A whistle typically produces a high-pitched sound, while thunder is a deep rumbling noise.
The cord that holds a whistle is called a lanyard. You'd see this type of medium-thickness, white rope-like "neck cord" with a large whistle attached, with the whistle resting at the middle of the chest, worn around the necks of lifeguards, sports referees, etc. The term, lanyard, originally was a nautical term meaning a rope used to tie or secure something on a ship, such as the ship's rigging.
Runaway ship
7 or more short blasts on the ship whistle and general alarm bell followed by one prolonged blasts