shamus and murphy were walking down a country lane when they see 2 tramps one hanging the other over a bridge by his feet catching fish..
shamus says "hey murphy... next bridge we come to well do that"
so off they trot and sure enough they reach a bridge... shamus hangs murphy over by his feet and hours go past.. finaly murphy shouts "quick quick pull me up"
"why ? have you got 1?" replies shamus
"no!!" says murphy "theres a train coming"