Some things I've been wondering about :

1.  What happens to the middles of holes ?

2. Why, when a group of people are walking on a cliff path, does one of them always remark on there

   being a long drop on one side of the path ?  It's a cliff, what else do they expect !  

3. The newspaper photographs of convicted terrorists always show physically unattractive people - are the pictures taken by incompetent photographers or have the subjects become terrorists due to lack of social success ?

4. Why ask "how are you?"  if you don't want to know ?

5. Why do people say "I'll ring you back" if they aren't going to bother ?  "Goodbye" would do.