So Saturday morning, the envelope is delivered by said child. Jack took it from her, and looked at it, then at me, then at the envelope, all the time his little face becoming more and more concerned-looking.
He handed it to me, and I (as Mums do) read aloud -- To Mummy, From Jack! in my most enthusiastic, what-have-we-here voice.
Jack looked even more concerned.
"Well, this is a little awkward" he said. "I've never seen that before in my life."
When I finished laughing, I showed him that his teacher had just wrapped his card, much to his relief!