I recently stood near with two distinguished professors of architecture who were talking about a colleague obsessed with replacing concrete with a material derived from a fungus.

They were about to move on with their conversation.

I rudely interrupted, apologised for my brain, and explained their colleague had a point, because concrete structures were less roomy than fungus ones...

... because there's not mushroom.

They regarded me as one may look at a developmentally challenged toddler.

No regrets here though.