Didja hear the one about Michelle Rafferty’s 7-year-old boy, Luke? Seems Michelle signed him up for a one-day camp on the other side of Lake Coeur d’Alene. Which required a short boat ride aboard the Mish-A-Nock. And that made Luke nervous. Michelle knew why, too. Hubby Max had let Junior see “Jaws” — and now he’s convinced that there’s sharks in dat der lake. (Hey, don’t laugh. My wife was so afraid after seeing “Jaws” way back when that she was afraid to turn the light off at night for fear one would get into our house.) So, Michelle tormented hubby Max for a week about letting Luke see “Jaws” — only to discover that she was the guilty culprit for letting him watch “Titanic” a month ago. Michelle felt so guilty about the situation that she paid for a cruise Tuesday night for the whole family to prove to Luke that — (drum roll, puh-leez) there were no icebergs in Lake Coeur d’Alene.