Crazy Frog, originally known as The Annoying Thing, is a computer animated character created by Erik Wernquist. Marketed by the ringtone provider Jamba!, the animation was originally created to accompany a sound effect produced by Daniel Malmedahl while attempting to imitate the sound of a two-stroke moped engine.

The Crazy Frog spawned a worldwide hit single with a remix of "Axel F (Axel F (Crazy Frog song))", which reached the number one spot in the United Kingdom, Ireland, Turkey, New Zealand, Australia and most of Europe. The subsequent album Crazy Frog Presents Crazy Hits (Crazy Hits) and second single "Popcorn (Popcorn (Crazy Frog song))" 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.