I don't see a problem with it. The kid weighs like 50 pounds. Now if me or Gruntersdad or Fat Elvis did that, we'd crush the drums to splinters, but not some skinny kid.
There was a thread a while back on standing on the bass drum. As long as the drum is reinforced and the person isn't too heavy, it's not a problem.
I used to play at a piano bar and two people would get on top of the grand piano and dance sometimes. Standing on an instrument can be really dramatic if it's done correctly.