So, sometimes my leg will do this weird thing where it jumps up and down *really* fast, almost like I'm bouncing a little kid around on my knee, but faster. It's not the same as when I'm just fidgeting or moving and don't realize it. This is completely uncontrollable unless I physically hold my leg down with force.

It has been happening as long as I can remember, and I don't think there are any other factors that unify the situations in which it occurs.

Does anyone else do anything like this? Is it an ADHD thing or a spasm?

:confused:

A spasm is possible, it could be related to ADHD or it could be RLS, Restless Leg Syndrome.