The Annoying Thing made its debut as a marketing tool in 2001, when it appeared in Belgian ringtone commercials. By 2004, the character -- rechristened Crazy Frog -- was licensed as a sound and video ringtone for cellular phones and was accompanied by a massive advertising push that included a deluge of TV commercials. Crazy Frog's popularity peaked in the spring and summer of 2005, when the full-length single of the "Axel F" ringtone, which was created by members of the German production team Bass Bumpers and based on Harold Faltermeyer's instrumental theme for Beverly Hills Cop, topped the U.K. singles charts for several weeks. It was so popular that it kept Coldplay's comeback single, Speed of Sound, from debuting at number one. Later that summer, the ringtone and full-length album Crazy Frog Presents Crazy Hits marked the Frog's arrival in the States. In 2006, the Crazy Frog phenomenon was still healthy in Europe, with toys and gadgets available and a potential TV series in the works; that summer, the Frog dropped another album, aptly named More Crazy Hits. ~ Heather Phares, All Music Guide