In season 1, episode 2 of Samurai Jack, Jack comes out of the time portal in the future and lands in a city with flying cards and other machinery he does not recognize. After some action sequences Jack lands to safety next to some onlookers who cheer him and say things like
Yo, Jack, that was some awesome show
I have never seen a punk with moves like that, Jack
Word! Jack was all ricochetic and jumpadelic!
Why do they call him Jack though? Jack would later go on to take this name, but it is unclear why the onlookers would call him Jack before this though.