Boy that's alot of plants, do you have a picture?

Unless you want a whole range of wild guesses, you'll need to include a photo.

Crassula tetragona for the completely-blind guess test.

No, Kalanchoe diagremontana!

Rob, it'll always be Bryophyllum to me, but I think you're on to something using the little grey cells as you do, Monsieur.