A tongue twister is a phrase, a sentence or a combination of words designed to deliberately cause slips of the tongue. It is a game which is often expressed in the form Say this phrase three (or five, etc.) times as fast as you can. Tongue twisters are designed to be mispronounced for the purpose of creating humorous utterances and having fun. This research aimed at discussing features of tongue twisters in general and analyzing Persian tongue twisters in order to discover the subtle techniques used in their creation. In the section it discusses why a tongue twister causes errors and if they are the result of speech planning, short-term memory difficulty or can be attributed to articulatory implementation. Then it addresses the structure of tongue twisters as well as the question: During which phase are errors made? In the second section, the voice recordings of several subjects including children, young adults, and adults who had repeated Persian tongue twisters were transcribed into phonetic transcriptions and then analyzed. The findings of this research indicate that Persian tongue twisters involve similar fricative, affricate, liquid, stop, and nasal consonants, unsimilar consonants, vowels, minimal pairs, exchange of linguistic elements, and numerous repetitions of the same word.