How, what or why, I have not clue either how this happens, but a guy told me some bullshit once, and I knew it was bullshit too. Untill he proved it to me, I never believed him until I seen it with my own eyes. He told me has a peg legger, but he always launched off the line with about a 1 ft scratch of both tires and was gone. Just normal driving, he'd punch it and spin 1 wheel. Finally one day, he told me his trick and could not explain why it worked, then I thought back and realized, yes, he always did back up to the line, or he'd drive way forward of the line, like 50ft or so, then back up and do a dry burnout, not a big burnout, just enough to warm the tires. Then he'd be way out there again, and back up to the line about 40 or 50 ft. Then he'd give his normal 1ft scratch and be gone. His trick was to back up, then under power it worked like a posi long enough to get him off the line. I seen it many times, I even checked for an air line or wire thinking the guy was BSin. If he did, he had it hidden very very well. Can anyone explain that one?