The Keep Calm trope has regularly upped my chuff levels, and I had a sudden bout of WWED, realising that Mrs Peel would definitely do her bit, so here you go:
That quote above paraphrases the last line uttered by Emma Peel on The Avengers, just before she drives off forever: that’s why it’s a bit longer than the standard trope.
“The Avengers: The Forget-Me-Knot (#7.1)” (1968)
Emma Peel: [saying good-bye to Steed] Always keep your bowler hat on in times of trouble, and beware diabolical masterminds.
John Steed: [as she walks away] Emma… Thank you.
Here’s a few more referencing the more succinct style typical of the trope:

Keep Cool and Banter On

Keep Cool and Foil Schemes

Keep Quipping and Banter On
Categories: arts & entertainment, fun & hobbies
now these are definitely my favourites ❤