I like the robot who floats in the lower left corner of the page. But he bounces during scrolling. A lot.
(Update: I was using Edge. With Firefox the robot stays in place.)
I believe web designers had this figured out. Instead of repositioning with javascript on every scroll event, pin it in place with CSS absolute positioning. It looks better. No bouncing.
Another update: This other meta question also covers this: Site background image flicker
background-attachment: fixed,scroll,scroll;
onbody
element. $\endgroup$