Rule #1 of celebrating a championship -- MAKE SURE YOU DON'T FALL OFF THE PARADE TRUCK.
Members of the Gaelic football team Enniskerry GAA ended up having to celebrate their Wicklow Junior B-level football championship in the hospital over the weekend ... after several players fell off the parade bus when the railing gave out.
The video is INSANE ... members of the team were losing their minds celebrating the big win ... right when they went tumbling to the ground.
Somehow, the team says the 9 players involved are expected to make a full recovery after being transported to a nearby hospital.