Any actual words in the flag should be transcribed using IPA (the linguists' phonetic alphabet). This will result in several awesome things:
1. Users speaking slowly and carefully out loud at their computer screens to figure out the phonetic transcription of words as they type.
2. Users with different accents coming up with different answers.
3. The need for users to download IPA alphabets before using amule.
4. Most IPA characters require multi-key entry.
5. Things that occur in English that most people have no idea about, like alveolar flaps and aspirated consonants.
6. Users coming up with different answers depending on where each word is in the flag, for repeated words. (Most people pronounce words differently depending where they are in a sentence or an utterance, which makes a phonological difference as far as IPA is concerned, if not a meaning difference.)
May I also suggest that the correct answer correspond to the pronunciation of someone speaking BRITISH English with a Swahilian accent, and that there be a time-limit for entry of about 30 seconds. Oh, also, agreed, no copy/pasting, that's cheating.