The title is a portmanteau of "Rock and Roll" and "Shamrock."
Plot[]
Merlin the Magic Mouse wants to travel the world so more people can experience his magic. He calls in Second Banana to choose an area via dart throw and pointing to the globe, but this results in Merlin being poked somewhere. After Merlin picks a place for himself, he and Second Banana travels to Ireland via magic carpet. However, the carpet grips onto a tree and unravels it, making Merlin and Second Banana crash-land into a shamrock patch. They come across the chief leprechaun, named O'Reilly, who tells the two mice to get out of the shamrock patch.
When O'Reilly doesn't believe Merlin can do magic tricks, the magician rodent performs for him. However, O'Reilly isn't amused as he finds out Merlin's magic rabbit trick is a fraud using a hand puppet. O'Reilly wants to use Merlin's pocket watch to make it disappear, but this allows the leprechaun to steal the watch and disappear with it. Realizing the trick, Merlin and Second Banana go after O'Reilly, but they fall off a ledge, and Merlin pulling a large paper airplane out of his hat doesn't help much. Merlin then sets up a leprechaun trap, but O'Reilly uses his magic to replace him with Second Banana while in the sack. Eventually, they spot O'Reilly's tree-house decorated with numerous clocks and watches, and O'Reilly offers to give them all the pocket watches he has.
Merlin and Second Banana fly home to sell the watches for a "small fortune", but the sack suddenly becomes empty. Distracted about the sack being empty, they collide into a clock tower presumed to be Big Ben, wrecking it. O'Reilly returns to teasingly ask for the time of day. The leprechaun flies off laughing, and Merlin says, "Oh... drat!"
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