Oh, yes, magic horn of tootings and hootings!

A magic horn in the Patrician's Palace is said to blow itself in warning.

Schlepcar transformed into the shiny metal-flake orange Wonderbug when a magic horn was sounded.

After minor skirmishes and defeats, Caspian decides to blow the magic horn that will send for help.

Huon tries to save her but is wounded; he manages to sound the magic horn and Oberon appears.

Oberon is summoned by Sherasmin blowing the magic horn.

When they attached a magic horn to the car, Schlepcar comes to life as Wonderbug.

Cornelius gives Caspian Queen Susan's magic horn, which will bring help to whoever blows it.

Finder had already whirled around and pulled his magic horn from his belt.

Trumpkin has blown Susan's magic horn, which always brings help when used.