- What's funny, Biggs?
- Oh, nothing, sir.
- Do, please, share your little joke with the rest of us. I mean, obviously, something frightfully funny's going on.
- No, honestly, sir.

11 seconds sound clip from the Monty Python's The Meaning of Life movie soundboard.

You can hear this line at 00:43:25.058 in the Blu-ray version of the movie.

Quote context

[...]

- Now, Carter.

- Yes, sir?

- What is it?

- It's an ocarina, sir.

- Bring it up here.

- The man now starts making thrusting movements with his pelvic area, moving the penis up and down inside the vagina.

- Put it there, boy. Put it there on the table.

- While the wife maximizes her clitoral stimulation by the shaft of the penis, by pushing forward. Thank you, dear.

- Now, as the sexual excitement mounts...

- What's funny, Biggs?

- Oh, nothing, sir.

- Do, please, share your little joke with the rest of us. I mean, obviously, something frightfully funny's going on.

- No, honestly, sir.

- Well, as it's so funny, I think you'd better be selected to play for the boys' team, in the rugby match against the masters this afternoon.

- Oh, no, sir!

- The Meaning of Life, part three. Fighting each other.

- Okay, Blackitt, Sturridge and Walters, you take the buggers on the left flank. Hordern, Spadger and I will go for the gun post.

- Hang on, 68. You'll never make it, let us come with you.

[...]