On the morning of Saturday, Dec. 3, Jay Desjardin headed outside to gas up his family’s old Subaru, which he and his wife Tammy use to drive around the island of Frenchboro, where they live. That’s when he realized that a vandal had “crammed” egg into his gas tank. The telltale signs were broken egg and eggshell inside and around the fill neck.

“He came in and we said, ‘What’s going on?’” Tammy said early this …