Not exactly a sign, and not exactly seen in passing, but there you have it anyway, #37

 

 

Professor Puffinton’s Facts, #5

 

 

 

 

 

 

 

Forgotten Moments in Cartoon History, #21

 

 

 

 

 

 

Forgotten Moments in Cartoon History, #20

 

 

 

 

 

 

(Not really a sign, but) seen in passing, #36

 

 

Signs seen in passing, #35

 

 

 

A sign (of something…I’m not sure what) seen in passing, #34