"Happy?" is a single from Mudvayne's third album, Lost and Found. It was released in 2005 and is a highly played song on the radio. The song was the theme song of WWE Vengeance 2005 and has been played as a commercial bumper track for The Jim Rome Show. "Happy?" was named both the No. 1 Headbangers Ball Video of 2005 and Billboard Monitor's Active Rock Song of the Year. The song held the No. 1 spot on the Billboard Hot Mainstream Rock Tracks chart for one week, and reached No. 8 on the Hot Modern Rock Tracks chart.

"Happy?" is featured on the video game "MX vs ATV -Untamed" as a jukebox song. It is one of the most (possibly the most) popular Mudvayne songs to date.

The music video for "Happy?" begins with the band, dressed entirely in black, playing the song in a field full of flowers on a sunny day. But after the first chorus, the sky darkens and a tornado emerges, seemingly out of nowhere, trying to sweep up the band. The storm subsides suddenly at the end of the video, showing that Mudvayne is unharmed and well.

The cover photo for the "Forget to Remember" single appears to have been taken during the filming of the "Happy?" video.

"Happy?" was made available for download on July 3, 2012 to play in Rock Band 3 Basic and PRO mode utilizing real guitar / bass guitar, and MIDI compatible electronic drum kits.

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Wikipedia