story hop
When in mid story, narrator decides that another story is better suited for the occasion. They then promptly switch stories with no warning.
Guy 1 "So just yesterday I was pulling out of my driveway when - Dude! Yesterday I saw this huge horse on the side of the road!"
Guy 2 "Next time do you mind telling me before you story hop. "
Guy 2 "Next time do you mind telling me before you story hop. "