I sometimes don't speak English anymore

The other day, in an email to a friend regarding an outline that a group of us were jointly compiling, I was complaining that one person didn't submit her section, missing the deadline by a number of days... my conclusion, however was that because her being late didn't materially affect me, I wasn't going to make any kind of a deal out of it.

Materially affect me?!?!?

You gotta be joking? Who writes like that in an email?

Answer: a law student.