Waxwork [Tony's Werewolf Turn]

Waxworks (1988): A new waxwork museum opens in the town of our protagonists which they decide to check out. However they are unaware that the exhibits have been enchanted to host sub-worlds with monsters within to kill them and make them part of the exhibit. Tony is one such victim when he falls into a exhibit featuring a werewolf and gets bitten. Just as the hunter of that world kill the main wolf, Tony starts to transform himself.

Example of:
Painful Transformation