lol, i've seen all of these, and in real life there are more. I've seen a inside out box that looks like it was just a holly box and it followed you if you look at it just right. Scared the crap out of me when i passed by it.
In #2, after the left star has disappeared, move your mouse in and out of the area where it should be. You'll see the mouse cursor disappear and appear again. Trippy!
Yeah #2 is a trip. #1 I could still see the pink balls. #3 only looked wavy when I moved my eyes to a different spot, and only for that 1/4 second. #4 all the lines are straight, just look at the edges at the distance between the lines.
In #2, after the left star has disappeared, move your mouse in and out of the area where it should be. You'll see the mouse cursor disappear and appear again. Trippy!