YouTube - The play icon changes to a replay icon at the end of the video.

YouTube - The play icon changes to a replay icon at the end of the video.

Vimeo - The bar you mouse over will grow taller so you known when to click.
/via Patrick M. Lozeau

Vimeo - The bar you mouse over will grow taller so you known when to click.

/via Patrick M. Lozeau

YouTube - If you are not logged in, the “respond to this video” textarea asks you to Sign in or Sign up on mouse-over.
/Via Marian Buhnici

YouTube - If you are not logged in, the “respond to this video” textarea asks you to Sign in or Sign up on mouse-over.

/Via Marian Buhnici

CNNArabic - Even the “Play” button has direction from right to left.
/via nikolay

CNNArabic - Even the “Play” button has direction from right to left.

/via nikolay

YouTube - Nyan Cat Progress Indicator on YouTube
/via @smorgasbrod
See it in action here

YouTube - Nyan Cat Progress Indicator on YouTube

/via @smorgasbrod

See it in action here

Vimeo - if you post a comment with a time indication, it becomes a link which opens the video on that time.
/via William

Vimeo - if you post a comment with a time indication, it becomes a link which opens the video on that time.

/via William

Youtube - Allows user to play snake with keyboard arrows while waiting for video to load or when it’s paused.
/via knallgrau

Youtube - Allows user to play snake with keyboard arrows while waiting for video to load or when it’s paused.

/via knallgrau

YouTube - Advanced menu options when right-clicking in the video player.
/via jeffsoo

YouTube - Advanced menu options when right-clicking in the video player.

/via jeffsoo

Chrome - When a tab in Chrome has updated content, a light gradient moves from right to left on the tab. Keep your eye on the upper left of the video.

/via Tim Banks

New ScientistSimple optical illusions can make it seem like the progress bars on your file downloads are moving faster than they actually are.