Yes, sometimes that happens to me. Usually, it is when I am kind of nervous and I will start out talking loud. A couple of weeks ago, I was having a driving lesson and I started talking to my driving instructor (loud)... he jumped! Also, when I am talking to someone privately, I notice that they will tell me to lower my voice because everyone else can hear.
_________________
This above text most likely contains text. If it doesn't, reload the page. If it still doesn't, something is severely wrong.