Do you think spoken English is difficult to understand?
You will change your idea if you listen to spoken Irish language... ;-)
For anyone going to Ireland to attend ILUG2008 and discover Dublin, I suggested to take a look to the funny posts written on Domi-No-Yes-Maybe blog:
"ILUG 08 a guide to Irish Idiom for our non-irish gests Part 1" .
Don't miss the other parts too ;-)