Yes, we know the meme. But what if you could let your website bounce to the Harlem Shake? Harlem Shake Bookmarklet → Not that tech-savvy? Try this instant Harlem Shake-ifier and change the facebook.com part with any url you want.
Resizer allows you to quickly change the dimensions of a webpage to test responsive design. Based upon a handy testpage by Matt Kersley, and a later modified version by Briccs.net. Also available as a Chrome Extension. Resizer →