.cock
So it occurs to me that if the Cook Islands formatted their top-level domains in the same way as the UK does, then you could get a site which would end in .co.ck - which shouldn't really completely amuse me, but somehow does anyway. If Austria did it you'd get co.at - which isn't anywhere near as funny, but is a bit like my last name. If Canada did it and Lao People's Democratic Republic did it too, and you combined them you'd get the name of a leading soft-drink manufacturer and the core ingredient in cocaine. Germanians would be speaking in co.de. In South Georgia and the South Sandwich Islands you'd be able to hear the co.gs turning when you visited their sites. All Lithuanian guns would be co.lts. While Morocco would be in a co.ma. In Niger they'd have ice cream co.nes. Probably that would make Peru so jealous that they wouldn't be able to co.pe anymore. There are many more potential ones on this page, but I'm at work so shouldn't be buggering around...
