Tastee Freeze immortalized forever.....
http://www.youtube.com/watch?v=feeHTm-dYGg
Anyone growing up in the mid west and over 40 probably remembers the summer only walk up DQ and/or Tastee Freeze.
They used to give out sundaes in mini baseball helmets where I grew up in Peoria, Illinois in the 70's. I think each week or so they had different teams. We all wanted Cardinal or Cub hats, but for some reason I remember getting a lot of Padre/Giant/A''s hats, so maybe they had a distribution issue.