The "Chuckle Brothers" nickname has been applied to Northern Irish former political enemies Ian Paisley and Martin McGuinness who developed a mutually-tolerant working arrangement when the Northern Ireland peace process at the end of the twentieth century eventually led to the two of them working together. They surprised many when they were sometimes seen laughing together in public. The nickname was borrowed from an English comedy duo called the Chuckle Brothers.
So jovial do they appear that one Ulster Unionist has dubbed them "the chuckle brothers." (BBC report)