The Box of Secrecy in its only use.
The Box of Secrecy is the site of emergency G.R.O.S.S. meetings when the tree fort is inaccessible or inconvenient to reach. It is a cardboard box with "G.R.O.S.S." written on the side. It was used only once, in the last G.R.O.S.S. storyline, when Susie Derkins stayed at Calvin's house. Hobbes asked if Calvin can poke air holes in the Box. The "Box of Secrecy" is a parody of the "Cone of Silence" from the hit TV show starring Don Adams, Get Smart.
"It'll build character!"
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