I looked at blonde kid's post about the inflatable champagne bottles, and instantly thought that we should bring these to a game:  http://www.amazon.co.uk/Air-Swimmer-870100-Shark/dp/B005ERDQAU/ref=sr_1_1?ie=UTF8&qid=1322345795&sr=8-1

They're remote controlled balloons, you can get sharks or clown fish.

Any thoughts?