On Wikipedia it says as follows
Rictusempra(Tickling Charm)Pronunciation: /ˌrɪktəˈsɛmprə/ rik-tə-sem-prəDescription: The subject experiences the sensation of being tickledSeen/mentioned:First seen used by Harry on Draco in Chamber of Secrets, when they fought in the Duelling Club.But if you go to,
http://www.YouTube.com/watch?v=vEPhYhKdJ7k
which is a you tube video of the Dueling Club scene from HP, when Rictusempra is cast it does not look ticklish
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