You may be an obsessed Muppet fan if you are suddenly hit by the realisation that Kermit and Piggy may not be able to have children, and you feel a deep sorrow realising how much sadness that would cause poor Piggy. (After all, Kermit already has something of a son in Robin...all Piggy has in the way of relations is Andy and Randy Pigs, so she would feel it more than he.)