This 1960s Squirt ad comes to us from a moment when nerdy was equivalent to “childish” — a funny reversal from the usual “nerdy guys are prematurely aged” trope (though prematurely aged nerds of this trope are wont to revert to infantile in the presence of an attractive member of their preferred sex, so perhaps that’s what we’re seeing here).
Squirt Is for Grownup Tastes, 1962
(via Boing Boing Flickr Pool)