It would be kind of funny if Han shot first but Greedo had a death spasm which caused him to continue to fire unpredictably after he was dead.

HAN : "I bet you have"

CANTINA GUY : "Mom Look!"

BAnG VErooM SPlanG!

HAN SLOWLY RISES FROM HIS CHAIR.

Sbpring VranG FroOm FiXZzz PiNg!

HAN SETTLES BACK DOWN AGAIN LOOKS BOTH WAYS AND GET'S UP TO RISE

RaTTataTTaTatTTTbaNgaSploooM!

CANTINA GUY : "Mom Look!"

WILHELM : "Wyahhh!"

VranG FroOm VErooM SPlanG Sbpring BAnG

CANTINA GUY : "Mom Look!"

BIKER SCOUT : "Help!"

HAN TENTATIVELY GETS UP SLIDES OVER TO THE BAR...NOTHING HAPPENS.

HAN : "Sorry about the mess"

Chucks a dime at the barkeep, Dead Greedo shoots it in midair only for the whole Cantina to begin to fall to bit Raiders style. He manages to run outside just as an alien space ship crashes into the Cantina roof and the whole building collapses.

PASSER-BY: "You lucky bastard"