freaky memory plus a hearty dose of silliness describes my DD3.9. My DD is a little over the top too and I spend a lot of time trying to help tone her down in social situations. She is very young but appears to be gifted and may have very mild sensory seeking tendancies that cause her to be a bit more intense, but it could be good old fashioned "over-excitabilities." He sounds like a normal gifted kid to me.