Mickey Mouse does not refer to the Disney character but rather something “ too easy, small, ineffective, or unimportant to be taken seriously” or something “annoyingly petty” (Merriam-Webster dictionary).
As sure as God made little green apples – just means ‘absolutely certain’. For additional emphasis it can sometimes be prefaced by the phrase mark my words because...
Non-sequiturs (a conclusion or statement that does not logically follow from the previous argument or statement.) that are always fun and which I’ve used in the last week:
No soap, radio – which is actually the punch line to an unfunny joke and has an entry in the Urban Dictionary and is, I guess, the epitome of a non-sequitur.
Why not, can’t dance – I thought I would find some reference to this but no, Google came up with nothing. It’s totally meaningless, a reply or response when a person announces, apropos of nothing at all, that they are going to do some particular thing.
And there are things I say just because I like the way they sound – like apropos (click the word for the meaning and pronunciation – there’s a little sound icon). I use the word in the phrase ‘apropos of nothing at all’ as a not very smooth segue from one topic to another. (Or in a description of someone doing just that – see above, ‘Why not, can’t dance’)
Ah, I almost forgot deathless remark . I used that yesterday in an email. It is used ironically when referring to something said, or written, that is trite, hackneyed or obvious (and far from deathless!)
I should keep a running list of the odd, and often archaic, words and phrases that I use, and love. Words amuse me, so why not share my amusement.