Skyle.
I have had the same thing happen to me. I bet the aircraft was a B747 - which tend to be quite light on the nosewheel at the best of times.
My case was deplaning the pax at Boston logan. Immigration used to be very slow there and only half the passengers were let off first - the front half. In the meantime, the loaders started to unload the front holds. We felt a lurch and the aircraft went into 'airborne mode' indicating it was airborne as the weight had come off the nosewheel extending the oleo enough to break the weight on ground microswitch. We realised immediately what was happening and both of us went or the PA handset. The other guy got there first and put out the ''Everyone to the front - NOW!'' call.
It was a brand new 744 and tail tip-ups can write off the aircraft. A lucky escape. 747 freighters nearly always have a tail stand inserted, or the noseleg tied to the ground while unloading. Or this can happen!
