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1. i can't believe you've done this
Something uttered by British people after they've been suckered punched. Usually preceded by the exclamation "Aw fuck", and accompanied by a look of complete bewilderment.
British guy: Blah Blah Blah Blah
British guy's friend: *punches British guy in the face*
British guy: "Aw FUCK, I can't believe you've done this!"
2. I Can't Believe You've Done This
the new meme, originating from the infamous youtube video

http://youtube.com/watch?v=8lBO23Dh23I
pete: hey, say thanks to your mum for me
sam: aw fuck, i can't believe you've done this
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