Mine is very odd. I'm trying to identify what it is exactly... It's like a twitch and a buzz in one. It's difficult to describe. In worried because I've never seen it happen. Every time I fold my leg up so I can watch the bottom of my foot to see if it's a twitch, it never happens! It's like it doesn't want me to see it! That's why I'm afraid though because I haven't seen in it happen, and with ALS twitches you can't seem them happen. Guess I'll have to get lucky and hope it happens where my foot is on a position where I can watch. Mines like a vibration/buzz with a twitch in the middle I guess you could say. Best way I can put it.