Well, hold the lid of this biscuit tin behind you, to protect your nether limbs.
10 seconds sound clip from The Goon Show, Series 8, The Space Age classic radio program.
You can hear this line at 00:14:27 in the radio play.
Quote context
[...]
- Now Min, Min, get this, get this rocket strapped up your back, and stand in the fireplace.
- And remember, modern Min, keep your elbows well in till you're clear of the chimney.
- Oh, dear. What about the heat from the rocket?
- Well, hold the lid of this biscuit tin behind you, to protect your nether limbs.
- How do I operate them, Henry?
- Now let us check your outer space nourishments pack.
- All right, Henry. Let me see, one all-leather bag...
[...]