Hidden jokes in text

[ziparumpazoo]

This isn't the best shot, but the content makes me smile. Taken from 'Elements of Number Theory' by Underwood Dudley, proof that mathematicians have a sense of humor and enjoy a subtle joke:

( Under the cut for size and subject matter )

Challenge: Text, Writing and Print 6

[darkemeralds]

Bold as brass.

text

[sasha_feather]

( 2 signs I saw today )