Mark and Clark, a.k.a. Hamburger Twins, are high school bullies from Solar Opposites.
Background[]
Mark and Clark are bully twin brothers who make lots of bets in high school. They have the tendency to press their chests around anyone who are unable to pay them to which they call it "Burgering".
When the "Where are they now" segment was shown, the subtitles person writing the captions becomes confused when it's revealed that the Hamburger Twins are actually father and son, despite being the same age.