Whenever you vandalize your own stadium in celebration, make sure your team has actually won.
Those goalposts aren't light either folks. Years ago an only-slightly-brighter-than-oatmeal cheerleading coach decided to put my high school's fifteen-strong cheerleading squad on the crossbar of the goalpost because it would "make a neat picture". The results of stacking nearly one ton of teenage girls on a structure barely meant to support itself surprised only the teacher. Sent a bunch of them to the hospital and got nearly one of them paralyzed for life.