I think it got a bit far last year
when I refused to accept posters from students in my class if they had used Comic Sans.

I got around it by saying "it looks childish and I want work that looks professional".
( Rev. A-MOL is lurking around these parts again, Mon 15 Aug 2005, 13:10, archived)

Fail them!!
Fail them at IT (isn't it ICT nowadays? am getting old) if they use Times New Roman 'cos it just means they can't change the default font :P I always had my work in Book Antiqua, never fails to get me more marks that.
(pumpkin pie, Tue 16 Aug 2005, 12:21, archived)