Type: Charm
Pronunciation: ric-tuhs-SEM-pra
Description: Tickles the target until they become weak with laughter.
Seen/Mentioned: By Harry Potter on Draco Malfoy in 1992, when they fought in the Duelling Club.
Etymology: Possibly the sum of two words; The Latin rictus, meaning "The expanse of an open mouth", and semper, meaning "Always". Rictus is generally used as an expression of terror, however, "always an open mouth" would, in most cases, correspond to the act of laughing uncontrollably.
Notes: It can be bought at Wiseacre's Wizarding Equipment in Diagon Alley in LEGO Harry Potter: Years 1-4.