Secret messages on LP's?

Hi,

I cannot be the only person who has noticed that many older LP's have little, sometimes jokey messages etched into the blank area near the lead-out groove. For example, on my copy of James Taylor's "That's Why I'm Here," the lead-out area of Side 1 says, "Purina Ear Chow." And I believe that one of the three LP's from the Emerson Lake and Palmer live album, "Welcome Back My Friends To The Show That Never Ends" has "With Love From Andy & Arun" written there.

Anybody have other gems on their LPs?

And who in the production process would be putting these little messages there, anyway?