It’s the Trending Now Top 5 Countdown for September 5, 2012, where we gather the hottest and most outrageous MUST-SEE YouTube videos hitting the Web today and send them all straight to your screen. It’s like watching the best of YouTube — only faster!

From a bad lip reading of Twilight to Mad Men performing Rick Astley to amazing optical illusions, we have you covered right here on What’s Trending.

For daily YouTube Trends and celebrity interviews, watch us every weekday at noon PT/3 pm ET on YouTube!

#5: Mad Men Perform Rick Astley’s Never Gonna Give You Up

#4: Amazing Animated Optical Illusions

#3: Danny MacAskill vs. San Francisco

#2: “Edward and Bella” – A Bad Lip Reading of Twilight

#1: Michelle Obama speaks at the 2012 DNC

One More Thing!: Dexter’s Justice

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