I've been able to create some sort of "swish" noise by flick a knife, but it wasn't too audible.
People like to make fun of me for carrying. I get the last laugh, though, when I calmly walk over to them trying to tear a package apart and offer to cut it.
Flicking can be very satisfying and you're right, it does produce a nice audible effect.
I do love watching people try to tear open big packages like an ape. Heck, you need to have some kind of implement to open that darn plastic clamshell stuff.