I thought it was grey duck? But it isn't.
Husband had a gal in his friend circle at ISU from St Cloud. She didn't understand the word "casserole", and when described, she says "Oh, a hot dish!" So hubby and his best friend start giving her crap. "So what do you make a hot dish in? A hot dish dish?" Couple of days later, she comes back with "My mom says it's a hot dish glass pan."
Fast forward several years later, and we're invited to her wedding. Made sure we were the ones to buy her the small Corningware set they registered for, just so we could attach the note "Now you have your own hot dish glass pan."