International Tongue Twister Day is celebrated worldwide every second Sunday of November. Established in 2011, the day aims to highlight the fun and benefits of tongue twisters for improving speaking skills and pronunciation. Tongue twisters are phrases designed to be difficult to pronounce quickly, featuring repetitive sounds and complex phoneme sequences. The term "tongue twister" has been in use since 1895, with well-known examples like "Peter Piper" and "She sells sea-shells by the sea-shore" dating back to the 19th century. Celebrations often include hosting tongue twister contests, learning new tongue twisters in various languages, and sharing the holiday on social media using the hashtag #InternationalTongueTwisterDay. This observance is inspired by the former International Tongue Twister Contest held at the Logic Puzzle Museum in Burlington, Wisconsin.