Josh saw this in Brooklyn. I guess there are any number of animals for you to be wary of. Morefakedogsfrom the past. (also, when searching for these, found a truly disturbing number of posts about hot dogs.)
I don't usually post the following: newspaper headlines, personal email, craigslist postings, unprofessional websites. I also tend to not crosspost things from other blogs, since I have so much unique material waiting for me to get to it.
Things I see a lot: silica gel "do not eat"; hair dryer labels; inside the bus "do not drill"; Wal-mart sign about IDs; coffee machine with "2" cup sizes; employees must "wash hands".