When I'm happy, the feelings are bubbling up inside my bones and veins and I need to let it out. I need to dance, clap, jump on the spot, run, or flap my hands.
I am able to contain such outbursts of emotion in public... most of the time. Because I know people look at you funny when you start clapping your hands or dancing for no reason... I have been known to start running in the street for no apparent reason. The hidden reason is that I'm happy or excited. I have confused many a bus driver who assumed I was running for the bus stop... when I was in fact running for joy.
When I'm home, however, there is no reason not to. So, I can listen to a favourite song, look at a funny meme, or watch an awesome episode of my favourite TV series... and I can clap or flap my hands or dance, to my heart's content.
Welcome to my world. I am autistic and proud.