holy shitake mushrooms!
To be used in substitution of holy shit, such as followed by the -take after. The take is important for the phrase to be successful. Term invented by elementary school students as substitutions for cussing, such as the asstronaut 
Jimmy goes to the gas station, buys a lotto ticket. When he reaches home, and checks the lotto number, he screams in delight, "HOLY SHIT!" his wife stares at him. Looking awkwardly, Jimmy refines his sentence to avoid embarrasment. "-take mushrooms!" In the end, his wife thinks he's on crack. And thats how the holy shitake mushrooms! came to be.