I mentioned in an earlier post the delightfully funny Grammar Cop series over at Banterist.com. I thought I'd offer a few quick links to some of the ones I find particularly good....
...this one from the American Stock Exchange entrance
...this one about the self-obsession of French cheese
...this one from the martial arts studio
...this one, which I'm laughing about too much to summarize
...and lastly, this one, which has a nice variety of infractions.
Here is the full archive of all the Grammar Cop posts.