Julia writes, "This little poster, which dates from 1961 and advertises an appearance at Liverpool's Casbah Club, was handwritten by Neil Aspinall, the man who later became the Beatles road manager!" So I guess this early in the Beatles' career, they had to go with an anonymous endorsement (more beatles here and here).
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".