Bacon Bacon Bacon
From A KoL Wiki
Over in one corner of the pen, you spot a large wooden crate with a hole a couple feet above ground level, and some tiny markings. You step closer to inspect the marks, and recognize them as being hobo glyphs. Let's see... tophat, bowling ball, big X -- AAARGH!
From context, you deduce the glyphs as meaning "vicious bugbear will bite your groin if given the chance". You make some notes in your binder and hobble away, wincing.
Occurs at The Bugbear Pen with a hobo code binder equipped.