cracked rotors

[68sixspeed]

Hi- I know it's been discussed a bunch here, but for proof to the non-believer that drilled rotors are for looks and will crack, pic attached; now granted it took more abuse than I thought to crack them, fronts on my 2000 vette, approx 350 track miles to do it. (3-1/2 HDPE days), but also of worth while note- the holes become useless as they plug with brake pad dust. I kind of figured it was going to happen yesterday as after the 2nd 20 min run I saw the small cracks starting by a lot of the holes. It was a noisy/thumpy ride home!