I found out yesterday about a very sarcastic good morning greeting that I liked very much!
Since I came to Japan, my sleeping patterns changed quite a lot and there were times when I WOKE UP at 11PM and went down to the kitchen, saying good morning even thought it was already almost midnight.
The normal way to say good morning, as I am sure most of you know, is:
Reading: ohayou gozaimasu
Meaning: good morning (greeting)
Literally: (you) are early
Now the sarcastic expression for good morning I found out about yesterday is:
Reading: osoyou gozaimasu
Meaning: good "morning" (emphasizing it's not really that early or morning anymore)
Literally: (you) are late
I like how changing only ONE syllable in the expression makes such a difference in the meaning. I like how it still sounds polite but actually so sarcastic at the same time :P
Me like very much!