Kujiki Unbalance from Genshiken also comes to mind as a show within a show. And possibly the bounty announcement segments from Cowboy Bebop?
(after googling) Huh, apparently some KujiUn OVAs were actually made, so it probably doesn't count. How about Captain Proton from ST:Voy?
(after googling) Huh, apparently some KujiUn OVAs were actually made, so it probably doesn't count. How about Captain Proton from ST:Voy?
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‎noli esse culus
‎noli esse culus