Anne Elk's Theory on Brontosauruses
The plot of the sketch is that the interviewee, Anne Elk, cannot bring herself to describe the actual basis of her supposed new palaeontological theory on dinosaurs, specifically Brontosauruses. After several false starts during which she repeatedly and noisily attempts to clear her throat, Ms. Elk spends most of the interview circuitously leading up to the "theory of dinosaurs by Anne Elk bracket Miss brackets", making assertions like "My theory, which belongs to me, is mine." It turns out that in the end Miss Elk's new theory on brontosauruses is rather shallow: "All brontosauruses are thin at one end, much, much thicker in the middle, and then thin again at the far end." Her true concern is that she receive full credit for devising this new theory: "That is the theory that I have, and which is mine, and what it is too."
This sketch was also performed on the album Monty Python's Previous Record, under the title 'Miss Anne Elk'. The sketch inspired the concept of "Elk Theories" to describe scientific observations that are not theories but merely minimal accounts.