[[Janice stands at a white board, deriving the number of possible alignments of two sequences]]

Janice: ...pi arriving from Stirling's approximation here

[[She turns away from the board to lecture]]

Janice: Of course, we could extend this to the continuous case; say, two sound waves.
Janice: You'll need to replace the sums with integrals and consider finite probability intervals; Dirac deltas, perhaps.
Janice: It's a useful exercise.

Janice: But it won't be on the test.

[[She opens the door]]

Janice: Good luck on the final
Janice: Now, if you'll excuse me, I've got to catch my ride