Back in early secondary school, me and some kids would go into one of the residential homes at lunchtime and just watch a ton of TV - it was mostly Tivo'd Simpsons reruns, but occasionally we'd watch Cartoon Network (it was almost never Nickelodeon or Disney Channel, universally either CN or Tivo'd Simpsons) - and thus we watched a ton of episodes of Ben 10: Alien Force out of order with no context and I'd always wonder "why are they making such big deals out of these guys being plumbers? this show ain't about fixing pipes!"
Turns out they were just a space police called "The Plumbers". Huh.