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Too bad I do say those things, and if the ninja turtles say them as well, then they rock. Besides saying "what the hell" all the time would become quite annoying, we wanted to give him a little...

I personally like -

Cheese and rice! (sounds enough like "Jesus Christ"but you won't get the finger shakers after you.)
Holy monkeys!
Jaaaaaysus! (Heh)
holy freaking cr@p flinging monkeys...