A human head may penetrate a wall (brick or otherwise) at high velocity, producing damage only to said wall. The head in question may "shake off" the damage or, in worst case scenario, be forced to "listen to the birdies" for an unspecified, decidedly comical amount of time. Resulting humorous disguises, such as that of a gopher, are entirely dependent upon the location vis-a-vis the time frame of such a collision within a given short (citation or mathematical formula pending).
Also, unrelated, an owl in disguise (as, one might say, a miniature ghost with its head in its hands?) may attract attention to itself by illuminating its eyes at will, while uttering characteristic inquiries.