if you look int he archives, something special happens when Calvin has no beer…check around strip 80 or so (I think, to lazy to look).
characters: JN, Steve, Calvin, Zombie cheerleaders
Panel 1: outside bathroom door
Calvin: Now then, where shall we begin?
Calvin: Oh that’s good, do that some more!
Calvin: oh yeaaaaah. Gimmie some more of that!
Panel 2: same as panel 1
Calvin: nice and easy…
Calvin: Whoa! Hay! THAT doesn’t feel like a finger!
Calvin: Wait a minute! WHERE’S MY BEER!!!
Panel 3: JN and Steve outside the door, JN scared ready to run
Steve: uhhh…what to you suppose that means?