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Atrial Fibrillation (AF) can complicate Wolff-Parkinson-White (WPW) syndrome. The characteristic feature of AF associated with pre-excitation is the irregular Wide Complex Tachycardia (WCT) with varying morphology of QRS complexes, with a rate more than 200 beats per minute. Delta waves may be obscured when atria discharge at a rate of more than 300 bpm. This case describes rare ECG features of AF that may resemble AF with pre-excitation. Organised atrial activity may masquerade as short PR interval and delta patterns. QRS morphology does not change in AF.