Sounds like the opening line of about 1000 possible jokes:

Part A: 'So Gerry Adams and Ian Paisley meet...'

Part B: (choose one)

...'in heaven...'

...'in a bar...'

...'in hell...'

...'on a street in downtown Belfast...'

...'on a street in London'...

...'on a street in Derry'...

...'on a street in Londonderry'...

(forgoing two depend on who's telling it :-)

...'in the gents...'

...'in church'... (scratch that one, too unlikely)

Part C:

'...and one says to the other...'

Part D:

(Dave Allen can fill it in, he's cleverer than I.)