Inspired by Balonz saying "What in the Dickens" in that colander thread (well worth a read if you've not yet popped in there).
What words or phrases did your Nan/Granddad use as substitutes for swearing?
My Gran used to say "Stone the crows!" instead of "Fucking hell!" and she used to say "Will you dry up!" instead of "Shut the fuck up!"
Now you go.