"Parachuting" joke

Bubba and Jed took parachuting lessons, and were arguing
about who was best at folding a parachute.
Unable to resolve their dispute on the ground, they
decided to go up in a plane and judge by the midair
performance of their parachutes.
Bubba jumped first, pulled his cord, and started floating
down towards the earth.
Then Jed jumped, pulled his cord and nothing happened; he
pulled his safety cord- nothing. In a matter of seconds
he whizzed past Bubba, plummeting like a stone.
"Oh," shouted the Jed, yanking off his harness, "so ya
wanna race, do ya?!"