Related:

• Homer, to Lisa when she builds a perpetual motion machine during a teacher's strike
  In this house, we obey the laws of thermodynamics! Episode: 2F19, The PTA Disband...
• Skinner at the entrance to a historical park: Five dollars a child?
  ! Last year it was free! Woman at counter: Hmph, new ownership....
• Professor Frink takes over the kindergarten class, drawing equations and free-body diagrams on the blackboard to explain the workings of one of those things that kids push which makes the balls pop.
  Frink: N'hey hey! Ahem, n'hey, so the compression and expansion of the longitudinal waves cause the erratic oscillation -- you can see it there -- of the neighboring particles....
• Bart: Look, Mom, it feels really weird having you on my turf.
  How would you feel if I started mopping the floor?...
• To boldly go and watch Star Trek re-runs.
• Guide: This civil war cannon had been fully restored and is in ready-to- fire condition.
  But it's a good thing we're _not_ firing it because it happens to be aimed at the main support leg of that lookout tower....
• Free fuel, deliveries daily (re: solar energy)
• Bart: It's hard to see what's going on; I can only make out the fat soldiers.
  Skinner: All right, children, switch. [one of the soldiers spots the children] Man 4...
• Edna: How do you expect us to teach with these supplies?
  Well, this pointer's so old, it's worn down to a nub....