Bloody hell
Oh for Heaven's sake
Oh for God's sake
Rollocks
You are kidding me! (this to any inanimate object that isn't behaving, or even to an abstract concept!)
I worked for a London wine merchants in my youth. One of the directors always used to say "Schloss Bockelheimer!". I have to say it is rather satisfying to use as an expletive, it has all the right sounds! 
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Would you think it was odd if a younger person wanted to befriend you?
)
