"Kial vi estas en malbona humoro hodiaŭ?"

Translation: Why are you in a bad mood today?

[MauriceReeves]

Ĉu vi akceptas "Kiu pisis en via Cheerios hodiaŭ?"

[CsabaSndor]

You could say: "Kial via humoro fus'ig'is?" or "Kial vi humorac'as hodiau'?" - if you want to make it more casual.

[twelvetongue]

I wanted to translate it as "Well you're just puppies and kittens and unicorns farting rainbows aren't you?

[MrMatryoshka]

This needs more upvotes XD

[Druif]

Mi pensas ke la esprimo estas tre angleca tiel. Mi dirus "Kial vi havas malbonan humoron hodiaŭ"

[lyubomirv]

Bulgarian (and AFAIK Russian too, possibly other Slavic as well) uses the same construction of 'being in good/bad mood', so it's not exactly an Anglicism.

[zerozeroone]

Both ways are equally valid. (And about equally common.)

Searching Tekstaro de Esperanto with only Zamenhof texts:
en malbona humoro -- 2 hits.
malbonan humoron -- 1 hit.

en bona humoro -- 4 hits.
bonan humoron -- 12 hits.

Then, with all texts selected:
en malbona humoro -- 8 hits.
malbonan humoron -- 6 hits.

en bona humoro -- 14 hits.
bonan humoron -- 20 hits.

[Nvirjskly]

Hmm, seems weird, I would have thought that mood would be expressed using "havi" or as a verb "humoras malbone", but is seems that "en X humoro" is standard usage, even though the preposition seems arbitrary. Is this a neologism, or was this canonical usage?

[CsabaSndor]

Not a new expression at all. Zamenhof expressed himself like this. Nevertheless you can use: "Kial vi malbonhumoras?" or "Kial vi estas malbonhumora?"

[OrenHammer]

I really think, "Why are you in a foul mood today?" should be an acceptable translation.

[blovemaple]

humoro = mood? It is "temperament, humour" in Wiktionary.

[zerozeroone]

Temperment and humor (pardonon, mi estas Usonano) are synonyns for mood.

[WarriorCleberz]

I thought the same thing at first time, but I never tried to answer this phrase using the word "humour" instead "mood". But I believe that both ways are correct.