Teddy bear to spider

"If you must know, when I was three, Fred turned my — my teddy bear into a great big filthy spider because I broke his toy broomstick.... You wouldn't like them either if you'd been holding your bear and suddenly it had too many legs and..."

- Ronald Weasley explains the source of his arachnophobia.

This spell transfigures a teddy bear into a giant spider. Fred Weasley used this spell on Ronald Weasley's teddy bear in 1983 or 1984 in revenge for the latter breaking his toy broomstick. Ronald Weasley developed a severe case of arachnophobia due to this event.

Appearances

 * Harry Potter and the Chamber of Secrets
 * Harry Potter and the Chamber of Secrets (film)