"The worm has turned" is a reference to mediæval pornographic literature in which... well, suffice it to say that the word "worm" should not be taken literally.
"The tern has wormed" is an extract from an ancient Egyptian sourcebook of vetinary science and ornithology, although everyone is very confused as to whether this was a particularly clever bird in question or if it is just a mistranslation.
Irish bars in New York, in an effort to dispel the common American stereotype that all Irishmen are consistently drunk, have all sold out to Starbucks.
St Patrick did not chase all the snakes from Ireland. He missed four of them who were hiding in a gooseberry bush. They have been breeding ever since, and now form an army 30,000 which is preparing to take over, just as soon as they can figure out how to work an Uzi with no opposable thumb.