I had the same thing happen to me just last week. I after replacing my front brake pads I put the lug nuts on with my impact wrench (bad choice) I later took the car to sears to get the tires balanced and they initially could not get a couple of the lug nuts off. They did not want to keep trying and claimed that the lug nuts could break off. The mechanic agreed to soak the lug nuts with wd40 and try again. It worked, but I learned my lesson. I am going to buy a torque wrench before my next diy job.

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KCScout
98 S420 My Wife's Baby
97 S320 My road car
83 300D My old road car (love that diesel)
81 300SD Wife's former Baby
81 240D A fun stick shifter
71 220D My first one