New stuff is often "scary"... Denna and I worked on the "usual" stuff (umbrellas, hats, canes... no broadswords, though) when she was really little as part of her socialization practice.
Now she's 2.5 yrs old and still occasionally will 'freak' about something. When I see her flinch at something, I tell her to "go check it out" (our cue phrase from her early years) and point to the item in question... that's her cue to stop, sniff, and investigate - which she will do, cautiously. Once she's past the item the first time, we try and pass by it again, right away, to make sure that item has been added to her "don't need to freak-out about that" list.