Animal heads on the wall. Like Gascon in Disney's Beauty and the Beast. It's supposed to be a sign of manliness or virility or something. "Hey! I killed Bambi! Rock on!".
On an episode of Fawlty Towers, Basil Fawlty (John Cleese) tries to mount a moose head up on the wall of the hotel, only to have it fall on his head. The running gag in that episode is that The Major keeps on hearing voices from the moose head so he thinks it's robotic or something. ("Japanese, is it?" "Canadian, I think." "Well, I didn't know the Canadians were as clever as that!") Really, though, the voices come from Manuel, the Spanish bell boy.