Went to the Frost Museum of Science in Miami. They had this big (6ft x 6ft) video display and four 6-inch diameter track balls where you guided a vessel through the virtual ocean or something. These two academic minded parents asked their sons (maybe 8 and 10 years old) to try the exhibit. They ran over excitely and just started pounding on the track balls with their fists as hard as they could. They of course did not understand the exhibit at all, but they had a great time! :-)