I used to and then I had to use one as part of my job. I need to explain more...
I used to jump at any sudden loud noise and I dissliked loud noises. Even people shouting...
When I had a job on the railway there would be many sudden loud noises like a train going past the one I was working at speed etc. After a while I grew immune to sudden surprizes, and while on that job, as it had ever changing shift patterns where no start time would be the same as the next day other then a rare occasion, my body became numb with tiredness. I would have days of being physically numb. I just didn't jump when someone tried to give me a fright! I left the railways in 2007 and slowly I started to jump when I have a sudden unexpected noise again.
As part of the guards job on the railways, yes, I used to use the whistle daily and it even gave me a fright when I blew it!
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