Erin and family spotted this one at an amusement park, which explains why handstamps are even a thing, but it does not explain who the "we" who accept them is, or if it's enough to get you on the train. Maybe just not enough to get you kicked off.
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".