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I just did a tune up on my 2000 Civic LX.(251000 miles). The old plugs looked like this any idea why? They honestly couldn't have more than a couple thousand miles on them, and maybe two years old. Three years max. I've worked on cars my whole life and I never seen plugs look like this. Is there anything that caused this that I should be worried about?

Never seen plugs like this why did this happen?

 
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What exactly do you think is wrong?
They look normal enough

 
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You might be running a touch lean, but those spark plugs look pretty good for a car with that mileage.

 
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Yep....they were the NGK LR plugs which I have never seen before...I feel like an idiot