Yep, all would startle anyone who so happens to be walking by! We had quite a few people walk by, either doing door to door advertising or just taking a stroll in what is normally a quiet street! Although I will say it was VERY loud! I could hear it from the other side of the house and when I went up close I needed earmuffs!
I'm sure you needed earmuffs for what you did too, though.
Anyway, back on topic!