To (semi) Quote a very good piece of Fan fic written when the borg were fairly new
Borg cube "We are the Borg , resistance is futile, you will be assimilated (etc)"
Response "This is the Solarian Scout Vessel 3011 of task force Imperial splendor you have 15 seconds to surrender"
Borg opened fire
The one man scout vessel returned fire the Borg cube Vanishes instantly
pilot then hails his base ship (40 times the size of a cube) and says "Lord commander we have encountered an inferior species in need of extermination I am forwarding scans now , glory to the eternal empire"
the rest of the story is about Star fleet trying to save the Borg from the Solarian Empire.