(from a front view, Marge appears to be sitting on the couch while watching TV)
Lisa: Dad, Mom's getting worse. You need to take her to see a real psychiatrist. Look how tense she is!
Homer: She's fine!
(cut to a different angle, revealing that Marge is actually "sitting" in thin air several feet in front of the couch)
Homer: Oh.
—The Simpsons, "Fear of Flying"
