Crazy Frog, originally known as The Annoying Thing, is a computer-animated character created in 2003 by Swedish actor and playwright Erik Wernquist. Marketed by the ringtone provider Jamba! (later known as Jamster), the animation was originally created to accompany a sound effect produced by Daniel Malmedahl in 1997 while attempting to imitate the sound of a two-stroke engine.

The Crazy Frog spawned a worldwide hit single with a remix of "Axel F", which reached the number one spot in Turkey, New Zealand, Australia and most of Europe. The subsequent album Crazy Frog Presents Crazy Hits and second single "Popcorn" also enjoyed worldwide chart success, and a second album entitled Crazy Frog Presents More Crazy Hits was released in 2006. The Crazy Frog has also spawned a range of merchandise and toys, and two video games.