woot today i burned rubber!

ok today i was having fun cruising around town in my J30. Then from a light i put the pedal 2 da metal and when it shifter from 1st to 2nd gear it caused the rear wheels to loose traction and it made some tire tracks. first off there was no debris on the ground plus i have 2 subwoofers in the trunk along with 70 lbs of sand. sorta of wierd and cool as to how it happened. just letting yall know.