The Vimeo menu bar has a "sub" menu that causes the ENTIRE PAGE below to jump down even when you just casually pass over the menu in the header with your mouse. This is VERY ANNOYING and often causes me to click on something I didn't intend to since the page shifts up and down.
Vimeo, this is a DESIGN FLAW. Please rethink this horrible interface function. Maybe just make the sub menu "float" over the page rather than forcing the entire page down to accommodate it. Or how about DELAYING the sub menu's appearance by a second so the casual mouse fly-by doesn't trigger it?