From Wikipedia: Schnuffel is an animated cartoon rabbit made at the end of 2007 by the German media company Jamba! for the marketing of one of its ringtones. The ringtone was turned into a song by Sebastian Nussbaum and Andreas Wendorf and recorded under the title Kuschel Song ("cuddling song"). The single was released in February 2008 and the ringtone rabbit made it immediately to the top of the German and European charts.

Read more about Schnuffel on Last.fm.