I've got a wiggle-butt. When I see someone, my whole back end shakes with excitement. So it should come to no surprise that sometimes I wiggle backwards causing an ornament (or two) to fall off the tree.
Because of this, mom only hangs shatter proof ornaments on the bottom half of the Christmas tree. Not because I want to run into the tree, but because my back-end gets so excited. So you see, its really not my fault.