P-A-F
2,738 US citizens perished on 9th September 2001 in the terrrorist attacks. As did 10 Australians. As did 67 UK citizens.
At the opposite end of the square to the US Embassy in Grosvenor Square (in London) is a memorial to those UK citizens that died in those attacks. A very sobering experience. As is the site of the WTC itself.
I think it reasonable to use the term 9/11 under the circumstances.
"yanks" and a bad teeth "smiley"?
It's not big and it most certainly is not clever. Just like gaining access to a military base without ID.
Before you ask, no, I am not American.
A poor show, Mr P-A-F.