I think I'd better come clean with you about this. It's not a virus, I'm afraid.

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

You can hear this line at 00:55:20.330 in the Blu-ray version of the movie.

Quote context

[...]

- Keep warm, plenty of rest and if you're playing football or anything, try and favor the other leg.

- Oh, righto.

- As right as rain in a couple of days.

- Oh. Thanks for the reassurance, Doc.

- Not at all. That's what I'm here for.

- Any other problems I can reassure you about?

- No, I'm fine.

- Jolly good. Well, must be off.

- So it'll just grow back again, then, will it?

- I think I'd better come clean with you about this. It's not a virus, I'm afraid.

- You see, a virus is what we doctors call very, very small, so small it could not possibly have made off with a whole leg.

- What we're looking for, and this is no more than an educated guess, I'd like to make that clear, is some multi-cellular life-form with stripes, huge, razor-sharp teeth, about 11-foot long, and of the genus Felis Horribilis. What we doctors call a tiger.

- A tiger?

- A tiger?

- A tiger in Africa?

- Hmm?

- A tiger in Africa?

- Ah, well, it's probably escaped from a zoo.

- Doesn't sound very likely to me.

- Sir! Sir! The attack's over, sir. The Zulus are retreating.

- Oh, jolly good.

[...]