John Moehring just emailed me with the info that Sid Fleischman published a toast trick (called A Toast to Magic) in his 1942 book Call to the Witness. The name of a selected playing card (value and suit)appeared on a piece of toast.
Crumbs. Looks like I started something. I've been burning to respond but it wasn't breakfast time over here in Australia. You should be able to do more than burn a boring card into your toast; you could have something that says "You thought of Paris, a Lamborgini, and your favourite spread is Grapefruit Delite".