Artist Jess England has created a Comic Sans typewriter, dubbed the Sincerity Machine. England explains the genesis of the project on his website:
As part of my ongoing thesis of questioning how we create, consume, store (and fetishize) media, it’s my wish that a classic, functioning typewriter altered to write in the most popularly despised font of modern times will provoke thoughts about such media concerns.
Although it doesn’t have Comic Sans, check out Rumpus iPad app Typing Writer, available with a distinctly more traditional font choice.