"Upside Down" 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, 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.