Truth or Cosmoquences/Beach Bummed - S5-E2
Continuity mistake: After Francis kicks sand into Timmy's face, Trixie is far from Timmy, but a shot later, they're closer together.
Smart Attack/Operation F.U.N. - S5-E15
Continuity mistake: In "Smart Attack", the scientists in the audience blow up, scattering shoes, glasses and clothing everywhere. In a few shots, after Timmy's dad is changed back to normal, all the clothing and accessories disappear.
Smart Attack/Operation F.U.N. - S5-E15
Continuity mistake: In "Smart Attack", Timmy's dad burns a plate of food right in front of Timmy. In a few shots, the plate disappears.
Answer: It's a joke. One cannot list all forms of entertainment. The list would never end. The boys were trying to convey how superior they were to the others, by saying that they were too good for comedy.