Ad-Libs or Pixie Picks!
Up until the late 60's, text on picks was limited to musical references, such as musician's names, companies etc. Then D'Andrea invented the Ad-Lib series with random words/phrases! A lot of the phrases were relevant to the time (post-Vietnam) such as 'Peace' and 'Bomb the Bum'. For a fantastic full article on them, read Joe Macey's feature here.