"Upside Down" (Bouncing off the Ceiling (Upside Down) outside Europe) was A-Teens' first single from their second album Teen Spirit. After the intense promotion in the United States in August 2000 the band went back to studio to start working on their second album. The song was first announced at the Viva Music Awards in September 2000. It was the first time they released an original song and not a cover, and it was produced by the hit makers Grizzly and Tysper.

The single reached Platinum on its 3rd week of release in their homeland and by early 2001, "Upside Down" had sold over 120,000 copies in Sweden earning a 2x Platinum Certification

"Upside Down" had a name change in the United States and Canada to "Bouncing Off The Ceiling (Upside Down)". The song reached number 93 on the Billboard Hot 100 while the physical single reached number 12 on the Billboard Hot 100 Single Sales Chart.

"Upside Down" became the band's biggest hit in the UK, selling 3,711 copies on its first day peaking at number-ten by the end of the week. The song received 8/10 Stars on UK Yahoo Music Reviews

This song became the A-Teens' biggest hit to date, as well as their signature song.

A DVD single of the song was released in the U.S. in February 2001 to coincide with both the single's release and Teen Spirit's release, and contains the music videos for both the title track and Mamma Mia from The ABBA Generation. The U.S. CD single itself includes the title track, Super Trouper (also from The ABBA Generation) as a bonus song, the music video for the title track, and a collectible poster that features a calendar for the first 6 months of 2001.

Directed by Patrick Kiely, the video was filmed in Universal Studios in Los Angeles from United States on October 13–15, 2000. It shows the band in an alternative world where everything is "upside down," and tells the story of one student who is in love with another student so much that they can't focus on their school studies; thus turning their lives "upside down." The dancing routine was choreographed by Wade Robson. The video reached number-one on several countdowns around the world. It was 2001's 25th most played video of MTV Mexico. The music video was uploaded on VEVO in November 2013 with 2.3 million views (as of October 24, 2015).

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