Rumble Pak. It was arguably the must-have accessory for the Nintendo 64, and had it been around during the time of R.B.I. Baseball, we're certain it would've went over well. One Andy Goetz decided that he'd be interested in reshaping history a bit, and spent 20-some-odd hours building a rumble device for his NES controller as a deadline loomed. He ended up submitting it in Oregon State University's Engineering Expo, and while it seems that they can't actually control when the rumble happens, at least your youngster will likely believe that he / she is doing something right while they're being humiliated by CPU racers in Excitebike. Cruel? Maybe. But totally practical.