Trillian: one font, three heights!
Trillian started out in just one size. Then I got into a discussion about how it makes font designers sad when people stretch their fonts taller, or squash their fonts shorter, because it makes the horizontal strokes off-balance.
So I said to myself, "Self, why don't you make a couple of additional heights of Trillian? So if people want it a little taller or shorter, they have it already in hand?"
Then I said to myself, "Self, those good folks could also use all three alphabets together! They can mix and match for a fun varying-height design, and everything would go great together because all three sizes share the same line weights!"
Then I stopped talking to myself, because people were starting to stare.