An interesting memory...

  
When my girls were babies, I had an "Ernest" mask on a stick (You know those movies... the late Jim Varney, "Ernest Goes to Hell," or wherever). I would play peek-a-boo with the mask... my oldest would start crying every time I covered my face with the mask... it was funny the first couple of times I did it (in an America's Funniest Home Video lowbrow sort of way)... I ditched the thing soon after... it stopped being funny... Maybe that explains a lot....