The May Queen

The hat–box was gone, and about six o'clock Ukridge appeared, so beaming and effervescent that I understood what had happened before he spoke. 'Corky, my boy', he said, vehemently, 'this is the maddest, merriest day of all the glad New Year, and you can quote me as saying so!'

Ukridge, 10 Ukridge Rounds a Nasty Corner

This reference comes from the Annotations compiled in Madame Eulalie's site 

'You seem to be approving of everything and everybody this morning.'

'I am. This is the maddest, merriest day of all the glad New Year, and you can quote me as saying so. Now then, what is it to be?'

Sam the Sudden, 18 Discussion at a Luncheon–Table

This reference comes from the Annotations compiled in Madame Eulalie's site 

He appeared to be under the impression that this was the maddest, merriest day of all the glad new year – a view in which he was vastly mistaken.

Laughing Gas, Chapter 13

This reference comes from the Annotations compiled in Madame Eulalie's site 

'My dear boy, it is what any member of my profession would advise. Do we by any chance know a beverage called May Queen? It's full name is "To-morrow'll be of all the year the maddest, merriest day, for I'm to be Queen of the May, mother, I'm to be Queen of the May". A clumsy title, generally shortened for purposes of ordinary conversation. Its foundation is any good, dry champagne, to which is added liqueur brandy, armagnac, kummel, yellow chartreuse and old stout, to taste. [...]'

Uncle Fred in the Springtime, Chapter 10

This reference comes from the Annotations compiled in Madame Eulalie's site 

'[...]. So stop cursing and swearing like a bargee, and let's see that sunny smile of yours. Can't your realize that this is the maddest, merriest day of all the glad New Year?'

Full Moon, Chapter 8

This reference comes from the Annotations compiled in Madame Eulalie's site 

'Bertie', she said, after a brief opening speech in the course of which she described me as a lazy young hound who ought to be ashamed to be wallowing in bed on what, if you asked her, was the maddest merriest day of all the glad new year, 'I've just been talking to Jeeves, and if ever a life–saving friend in need drew breath, it is he. Hats off to Jeeves is the way I look at it.'

Jeeves and the Feudal Spirit, Chapter 15

This reference comes from the Annotations compiled in Madame Eulalie's site 

'This', he said, 'is the maddest, merriest day of all the glad new year. I do believe in fairies! I do!'

Something Fishy, Chapter 25

This reference comes from the Annotations compiled in Madame Eulalie's site 

'I agree with you', I said, 'that this would appear to be the happy ending, and I can quite see how you have arrived at the conclusion that it's the maddest merriest day of all the glad new year, but there's something you ought to give a thought to, and it seems to me you're overlooking it.'

Stiff Upper Lip, Jeeves, Chapter 16

This reference comes from the Annotations compiled in Madame Eulalie's site