Not exactly a grammar issue, but somewhat funny in a cute way. I had a Chinese client who pronounced the word "bonus" as "boners". Once I asked her if she could tell me more about her duties as a manager in China and she said " I was in charge of giving boners to factory workers."
Back on topic... If anyone is starting a list of writing pet peeves, here are a few of mine:
gramm
Er, calend
Er, independ
Ant