#29 -- What wikipedia entry?
Here is the English Sign of the horns, but the phrase "cornuto is a light-hearted and inoffensive word" does not appear.

@vinnyD - the one referenced by the OP;
"Its use is playful and lightheartedly derisive, with little or no particular efficacy in scorning someone during confrontations as it is lacking earnest damning credentials, potentially leading all parties to a chuckle and smothering the feud at its inception"
In Sicily at least, it's extremely offensive to call a man "cornuto". Sure, you can call a mate 'cornuto' and it's jokey, but you call a guy in the street 'cornuto' and he's going to punch your lights out. And even with your friends, you need to be very sure that no offense will be taken before you use it...
In English, the term cuckold is rather archaic and using it today would be somewhat playful--providing everyone even knew the meaning, which is not likely.
Tell somebody "hey, dude, everybody knows your old lady's been steppin' out on ya, know what I mean?" and you could be in trouble.
Although to insult somebody and for them not to fully understand you could be a distinct advantage.
You ninnyhammer.
http://www.neatorama.com/2008/05/03/10-insulting-words-you-should-know/#/