In the Episode What a Night for a Knight, Velma and Scooby get seperated from shaggy. Scooby sees the Black Knight and runs into Velma knocking her glasses off. Velma, not being able to see without her glasses, mistakes the Black Knight for Shaggy and mistakes his moaning for shaggy being sick. She pulls Shaggy's medicine out of who knows where (but I'll let that one go). She pours the medicine and the shot cuts to Shaggy coming up on Velma next to the Black Knight. When the shot cuts back to Velma her glasses are magically back on her face,and she still does not notice the Black Knight beside her.