I'm a Grammar Nazi.
I have a passive-aggressive personality.
That mix of traits can be, well, volatile.
I won't come right out and tell you that you used the word "your" wrong.
No, I'd much rather wave my mug in front of your face while I talk about something safe, like the weather, and hope the subliminal message gets through.
Zazzle is full of such grammar geek mugs, as well as a wide variety of other items, that any Grammar Nazi would love to get they're hands on.
For the grammar police, I did that on purpose. For the grammatically challenged, I dare you to find what I'm talking about.