Perhaps I could raise the matter of "for" as a conjunction.
"Wow I am glad and happy too; for I was late for this discussion."
Or is "for" as a conjunction now deprecated.

Amen brethren.
In an unguarded unthinking non-PC moment in the supermarket I automatically waved back to a small child instead of turning away PC-wise ... it's just not 1960 anymore. I have also noticed that "bitch" and "slut" have become highly offensive now whilst OMG is just commonplace. And nobody says "crikey" anymore.

@WW etymonline.com suggests :
upon the soden (1550s)
and this does show up as such on google, although I couldn't quite get an exact date earlier than 1591.

I wonder by my troth, what thou and I
Did, till we googled? and texted?

@WW Can't remember Dryden but didn't Donne go like:

What did we do till we googled?

For God's sake hold your tongue and let me google...

http://www.grammarphobia.com/blog/2008/02/sudden-life.html

@WW evidently failed to convert. How about:
http://www.phrases.org.uk/meanings/all-of-a-sudden.html

MyLord,
"All the sudden" comes up in the London Magazine from 1738 and "all of the sudden" in John Dryden.
Try googling the phrases.

@WW "saint valentines day" with no apostrophe comes up in Hamlet.
According to Ngram the possessive sans apostrophe has upticked since 1980.
Of course Warner Bros knew their etymology and thus since there remains an 'e' before the 's' there is nothing to elide. Or perhaps it just didn't look good in CAPS. Who knows. It is all just a spelling convention which wasn't really totaly accepted till the 1850's with the coming of compulsory boredom, or education for children.

Perhaps leaving off the apostrophe is because some people can't be bothered to find it on the keyboard. (This might also apply to commas.)