This personal one is quite possibly the best to date. I was reading through a UK broadsheet and stumbled across this absolute gem:
The article was written back in 2003 around the time of the Iraq invasion and dealt with British-American animosity towards one another behind front lines, back at base-camp.
What had initially started out as friendly-on-friendly banter eventually precipitated into a full blown "dissing" contest. Such snide exchanges between 'grown-up, professional men', had naturally made their way into the Khazi's in the poetic form of toilet graffiti. Some of the American soldiers (the perpetrators in this case) had decided that this would be the most appropriate way in which to kick off. And it all started off with, "Yo Mama..!".
-- NOW. I should just point out that apparently, over in the States, this seemingly heinous comment has lead to the unfortunate demise of many a poor unsuspecting "Fool" and is thus considered to be the 'NO-NO' of all insults...Hallowed ground - Thou shalt not tread there!
Whereas this side of the pond, such an opening gambit would most likely be met with, "Well...Great?! Do you know her?"
"Well yeah!! Last night, I did such and such <insert crude expletives> to her"
"Did she now? Goodness! I never thought the old badger had it in her to land such a charming and endearing gentleman such as yourself..! Good on her!" --
Sorry, I'm detracting. The point is that this retort has led to much widespread confusion and thus flummoxed many a marine. Nevertheless, undeterred they continue in their quest to put down their British counterparts.
So - "Yo Mama is <this and that>...an' dont do <such and such> and aint even <blah-blah>..." - You get the picture. SONG & VERSE, ALL THE WAY DOWN THE WALL using a black marker pen, till it appears to have run out.
The British response?
A red highlighter going over the graffiti - circling grammatical, punctuation, spelling and syntax errors.
I nearly had a hernia.
And on that note, I bid you all Salaam and adieu!