It's nice to see how many people can actually do this. I have been able to shake my eyes since I was 4 and now that I'm 20, it's still going strong. One thing I have noticed though is that as I get older, I have lost the ability to keep it going for as long as I used to. When I first started I could do it for a minute to a minute and a half, now I'm lucky if I can get 30-40 seconds out of it, and it leaves my eyes strained. Now I was curious if anyone else has tried this, when trying to shake your eyes, instead of just going horizontally (left to right) have you tried vertically (top to bottom)? I have tried this several times, just to give myself a challenge, and I have found that if I really concentrate and strain my eyes I can get the slightest vibration going up and down. Thanks for anyone who answers this, and I'm glad to have found you guys, I'm not alone.