I meant for Melodeonboy to explain why he only wears wild shirts if his uncontrollable bouts of silliness are apparently rare.

He did say "One." It is clear he believes he is NOT locked in an interminble bout of silliness. His shirt selection surely indicates infinite silliness.

Perhaps he is a refugee from the silly shirt planet, found in north, north east quadrant of the clown attire nebula, in a dimension only to be accessed via back of Melodeonboy's wardrobe.