Guy walks into a pub furtively clutching a mysterious paper sack. He very carefully sets the sack down and orders a pint. Several regulars at the other end of the bar begin whispering and pointing at the sack. One regular steps away from the group and approaches the man. "So, I hope you don't mind me asking, but we're a bit concerned. Would you tell me what's in the sack?" "Well," says sack-man, "it's a bomb." "Thank goodness," says the regular, "we thought it might have been a bodhran!"