Was once in Sligo visiting a non-folk musical sister of a girlfriend. Suggested we find a session in the town. There were lots but it was the wrong night for most of them.

Eventually found one in a dark and dismal upstairs bar. Got the beer, sat down to join. As my eyes got acustomed to the light I saw the posters on the walls around me.
Kept my mouth shut (Me being a Londoner) and held a low profile, Drank up and left.
Posters told the tale that it was the local branch of the IRA!

Chas