The Tickle Belt being used on Man Ray
The Tickle Belt is a lethal weapon and accessory owned by Mermaid Man and Barnacle Boy. The belt tickles enemies into submission or to the point of wetting themselves. The belt can only be taken off by a special key, but it is not very much needed, because it is impossible to try to take it off while being tickled. It tickles so effectively that it leaves its victim rolling on the ground, giggling continuously unless turned off. The Tickle Belt was used against Man Ray to make him nicer. It was shown by Man Ray that you can become immune to the Tickle Belt.
The Tickle Belt was first seen in Mermaid Man and Barnacle Boy III, being used on Man Ray. SpongeBob claims it was seen on episode 17.