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Dan Johnson was a person who worked alot for Insomniac Games for many years, made inside jokes by putting a "Snow Dan" in Ratchet & Clank: Going Commando and Up Your Arsenal, until he passed away during the production of Size Matters. Then Insomniac Games put a tribute of him at the end of game credits and made him into a skin for Ratchet & Clank Future: Tools of Destruction and A Crack in Time.