I WAS DRIVING WITH TWO OF MY BOYS IN BOOSTERS IN THE 3RD ROW SEAT. THE BOY ON THE PASSENGER SIDE PULLED THE MIDDLE SEAT BELT DOWN FROM THE CEILING AND WRAPPED AROUND HIS NECK TWICE AND THEN PUT THE BUCKLE IN THE LAP CLASP. I WAS DRIVING AND HAD THE RADIO ON. LUCKILY MY 14 YEAR OLD DAUGHTER NOTICED HIM STRUGGLING AND BEGAN SCREAMING, "HE'S CHOKING, HE'S CHOKING"; SHE IMMEDIATELY JUMPED OVER THE SEAT AND TRIED TO FREE HIM WHILE I STOPPED THE CAR IN TRAFFIC. SHE FRANTICALLY TRIED TO UNDO THE BELT; HE WAS UNABLE TO MAKE ANY NOISE. ANYONE THAT HAS A SIENNA KNOWS THAT THE MIDDLE SEAT BELT ON THE THIRD SEAT CLIPS INTO A LAP BELT THAT YOU NEED A PEN OR KEY TO RELEASE. AS MY SON STRUGGLED, AND WIGGLED TO FREE HIMSELF THE BELT BECAME TIGHTER, LOCKED IN AND WAS BASICALLY HANGING HIM IN HIS BOOSTER SEAT. I STOPPED IN TRAFFIC, GOT IN BACK AND WAS ABLE TO LIFT THE BOOSTER UP IN THE AIR SO THAT IT WASN'T CHOKING HIM BUT COULDN'T RELEASE THE BELT. MY 15 YEAR OLD WAS IN THE FRONT SEAT AND I ASKED HER TO TAKE THE KEYS OUT OF THE IGNITION, WHICH I USED TO RELEASE THE BUCKLE. MY SON IS FINE. LUCKILY MY DAUGHTER SAW WHAT WAS HAPPENING. *TR