I know, just imagine...drivin in yer car enjoying a bowl on your way home then BAM! Get slammed from behind, surrounded by cops drawing down yelling GET OUTTA THE CAR! You open your door they yell NOT YOU...wait...YEAH! YOU OUTTA THE CAR!!! As all that smoke rolls out, and turns out they weren't even really after you.
I think that's what they refer to as a twofer!