He was having a pretty decent day to begin with, we took the lego's to the dr office and played lego's the entire time there, which was over an hour. That in itself is not "the norm".
He was winding up when we left, it was supposed to be short-lived, so we gave it to him. When we got home, he parked in the living room with the lego's for 6 solid hours. He did nothing but lego's to the point of being obsessive. He'd get an idea to build something, but get so caught up in finding a piece he needed. Then he'd find the piece, then he'd have to find ALL the pieces like it, put them in a pile, count them over and over. When he did finally build with them, it was pointless, he just stacked them one on top of another.
He talked, non-stop, til midnight. He'd swap topics in mid-sentence, his brain was obviously flying faster than his mouth. Many thought were never even finished before the next one was being blurted out mid-sentence. He stuttered, struggled to put words together. His tolerance for frustration was smaller than normal, his mood was all over the place, when he was coming off of it, he was MEAN, spiked with short bouts of wailing and flailing about who knows what.
Yeah, he wasn't running around like a headless chicken. But his brain was.