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A bizarre attack, in which a customer lashed out at a store clerk seemingly at random, had police investigating in Muskegon Thursday.

The incident played out around 7 p.m. Wednesday evening and involved a customer at Psycle Sam's Heady Glass.

Security footage taken from inside the Apple Avenue headshop showed the suspect wearing a green hooded sweatshirt milling about the store for several minutes prior to the attack.

The man seen in the video then turned and appeared to whisper to another shopper beside him near the bottom of the frame.

Seemingly without warning, the customer then turned and sucker punched the employee